PHYS-302 Physics 2: Exam 1 Combined Sets
What is the frequency of a wave having a period equal to 18 seconds? A. 6.6 × 10-2 hertz B. 5.5 × 10-2 hertz C. 3.3 × 10-2 hertz D. 1.8 × 10-2 hertz E. 8.0 × 10-3 hertz
B. 5.5 × 10-2 hertz
B.4 Identify instances of sound interference in everyday situations.
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B.2 Define the terms amplitude, period, frequency, wavelength, resonance.
- Amplitude - Period - Frequency - Wavelength - Resonance
B.3 Define antinode, node, fundamental, overtones, and harmonics.
- Antinode -Node Fundamental Overtones Harmonics
B.1 Describe sound as a longitudinal wave.
- Longitudinal Wave:
A.1 Recognize the SI units of the following quantities: velocity, acceleration, linear frequency, angular frequency, energy, spring constant sound intensity and sound intensity level
- velocity - acceleration: - Linear Frequency: - energy: - Spring constant sound intensity: - sound intensity level:
A.2 Formulate the units of derived quantities such as velocity, acceleration, linear frequency, angular frequency, energy, spring constant sound intensity and sound intensity level using the associated equations.
-velocity - acceleration - linear frequency - angular frequency - energy - spring constant sound intensity -sound intensity level
What is the ratio of the intensities of two sounds with intensity levels of 70 dB and 40 dB?
1000:1
What is the speed of sound at the atmospheric temperature of 30°C? A. 340 meters/second B. 341 meters/second C. 349 meters/second D. 300 meters/second
A. 340 meters/second
What is the speed of sound in dry air at 0°C? A. 316 meters/second B. 331 meters/second C. 346 meters/second D. 373 meters/second
B. 331 meters/second
What are the units for the spring constant, k? A. newton meters B. newton seconds C. newtons/meter D. newtons/second E. newtons/seconds2
C. newtons/meter
What do the length of the cord and gravity determine for a pendulum? A. velocity B. amplitude C. period D. speed
C. period
Maurice directs a beam of light on a sheet of glass at an angle of 51°. What is the angle of refraction in the glass? The refractive index of glass is 1.46. A. 22° B. 29° C. 32° D. 36°
B. 29°
A wave oscillates 50 times per second. What is its frequency?
50 hertz
What is the intensity of a 70-dB sound?
70 db = 10 log (I/10^-12) 7 = log (I/10^-12) I= 10^-5
Spring goes 1 complete oscillation with amplititude 0.5. Find total distance.
A + A + A + A = 4A A = 0.5 4A = 4 (0.5) = 2
What happens to a sound wave when it interferes with another sound wave having the same frequency but traveling in the opposite direction? A. A standing wave is generated. B. Beats are produced. C. A traveling wave is generated. D. Resonance occurs. E. The frequency of the resultant wave decreases.
A standing wave is generated. A standing wave is the result of the interference between two waves having the same frequency and traveling in opposite directions.
If a water wave completes one cycle in 2 seconds, what is the period of the wave? A. 0.5 seconds B. 4 seconds C. 2 seconds D. 0.2 seconds
A. 0.5 seconds
Chloe is playing the flute some distance away from a crowd. If the atmospheric temperature is 15°C, what is the speed of the sound traveling from the flute? A. 340 meters/second B. 330 meters/second C. 320 meters/second D. 310 meters/second E. 300 meters/second
A. 340 meters/second speed of sound = 331.4 + 0.61 x T speed of sound = 331.4 + 0.61 x 15 speed of sound = 331.4 + 9.15 speed of sound = 340.55 m/s
Honey bees beat their wings, making a buzzing sound at a frequency of 2.3 × 102 hertz. What is the period of a bee's wing beat? A. 4.3 × 10-3 seconds B. 2.6 × 10-3 seconds C. 4.0 × 103 seconds D. 2.6 × 103 seconds
A. 4.3 × 10-3 seconds
The frequency of the musical note F#3 is 1.85 × 102 hertz. What is its period? A. 5.40 × 10-3 seconds B. 1.05 × 10-3 seconds C. 3.09 × 10-3 seconds D. 5.31 × 10-1 seconds
A. 5.40 × 10-3 seconds
The velocity of sound on a particular day outside is 331 meters/second. What is the frequency of a tone if it has a wavelength of 0.6 meters? A. 5.52 × 102 hertz B. 2.56 × 102 hertz C. 459 × 102 hertz D. 675 × 102 hertz E. 990 × 102 hertz
A. 5.52 × 102 hertz
If light travels from oil (slower medium) to water (faster medium) at an angle, what happens to the direction of the light ray in water with respect to normal? A. It moves away from the normal. B. It moves toward the normal. C. It will move along the normal. D. It will move perpendicular to the normal. E. It stops traveling.
A. It moves away from the normal.
What happens to a light ray passing through the center of a lens? A. It passes without any deviation. B. It converges to the focal point. C. It travels parallel to the principal axis. D. It diverges away from the principal axis.
A. It passes without any deviation.
What happens to a ray of light passing through the center of a lens? A. It passes without any deviation. B. It converges to the focal point. C. It travels parallel to the principal axis. D. It diverges away from the principal axis.
A. It passes without any deviation.
An electric bell is kept under a bell jar in which a vacuum has been created. Slowly air is introduced in to the jar. What will happen to the sound of the electric bell? A. It will increase until it reaches its maximum. B. It will decrease until it stops. C. It will not change. D. It will increase and decrease periodically. E. It will decrease exponentially.
A. It will increase until it reaches its maximum.
Two sound waves of equal amplitude interfere so that the compression of one wave falls on the rarefaction of the other. Which statement is true? A. No sound is heard. B. The loudness of the sound increases. C. There is no change in the sound. D. The pitch of the sound increases.
A. No sound is heard.
Which statement best explains that sound waves are pressure waves? A. Sound waves have regions of compressions and rarefactions. B. Sound waves cannot propagate through metals. C. Sound waves move perpendicular to the medium particles. D. Sound waves cannot propagate through water.
A. Sound waves have regions of compressions and rarefactions.
Which statement is true about the critical angle of a medium with respect to air? The refractive index of the medium is taken with respect to air. A. The critical angle increases as the refractive index increases. B. The critical angle decreases as the refractive index decreases. C. The critical angle does not change when there is a change in the refractive index. D. The critical angle is equal to the refractive index.
A. The critical angle increases as the refractive index increases
When a wave is acted upon by an external damping force, what happens to the energy of the wave? A. The energy of the wave decreases gradually. B. The energy of the wave increases gradually. C. There is no change in the energy of the wave. D. The propagation of the wave stops immediately.
A. The energy of the wave decreases gradually.
If you were standing at the center of curvature in front of a concave mirror, what image would be projected? A. The image would be upside down, would look as tall as you, and would be at the same distance from the mirror as you are. B. The image would be upright, would look shorter than you, and would be closer to the mirror than you are. C. The image would be upside down, would look shorter than you, and would be closer to the mirror than you are. D. The image would be upright, would look as tall you, and would be at the same distance from the mirror as you are
A. The image would be upside down, would look as tall as you, and would be at the same distance from the mirror as you are.
What happens to a light ray if it is incident on a reflective surface along the normal? A. The incident ray retraces its original path. B. The incident ray is reflected perpendicular to the normal. C. The incident ray is reflected at an angle to the normal. D. The incident ray is not reflected.
A. The incident ray retraces its original path.
A source of sound is kept in a jar in a vacuum. Air is slowly introduced in to the jar. What happens to the sound coming out of the jar? A. The loudness of the sound increases gradually. B. The loudness of the source decreases gradually. C. The sound remains unchanged. D. The pitch of the sound increases gradually. E. The pitch of the sound decreases gradually.
A. The loudness of the sound increases gradually.
When a pendulum is at maximum displacement, which statement is true? A. The potential energy is at its greatest point. B. The potential energy is at its lowest point. C. The amplitude is at its lowest point. D. The frequency is at its greatest point.
A. The potential energy is at its greatest point.
Two sound waves traveling in the same medium interfere with each other. The compression of one wave falls on the compression of the other wave. What can you say about the resultant sound? A. The resultant sound will be louder than the individual sound waves. B. The resultant sound will be lower than the individual sound waves. C. The resultant sound will have the same loudness as the individual sound waves. D. The resultant sound will not be heard at all.
A. The resultant sound will be louder than the individual sound waves
Imagine that you are on Mars, and you are swinging a pocket watch back and forth. You time the period of this simple pendulum to be 2.6 seconds, and you measure the chain on the pocket watch to be 63 centimeters. Using this information, figure out what the gravity of Mars is. A. 4.2 meters/second² B. 2.7 meters/second² C. 3.1 meters/second² D. 3.7 meters/second²
B. 2.7 meters/second²
Natasha holds the two ends of a string in her hands and then moves her hands up and down so that a wave travels from one end of the string to the other end. In which case will she have a standing wave along the string? A. The resultant wave rises and falls in amplitude over time and has a frequency equal to that of the waves. B. The resultant wave has a fixed amplitude and a frequency twice that of the waves. C. The resultant wave has a fixed amplitude and a frequency equal to that of the waves. D. The resultant wave rises and falls in amplitude over time and has a frequency twice that of the waves.
A. The resultant wave rises and falls in amplitude over time and has a frequency equal to that of the waves.
A light ray is traveling from medium A to medium B. As it enters medium B, it bends toward the normal. What can you say about the speed of light in the medium? A. The speed of light in medium A is greater than that in medium B. B. The speed of light in medium A is less than that in medium B. C. The speed of light in medium A is the same as in medium B. D. The speed of light in medium B is zero.
A. The speed of light in medium A is greater than that in medium B.
How will the speed of a sound wave change if the temperature of the medium rises? A. The speed will increase. B. The speed will decrease. C. The speed will not change. D. The speed will initially increase and then return to its earlier value.
A. The speed will increase.
A transverse wave is traveling from north to south. Which statement could be true for the motion of the wave particles in the medium? A. Their direction of motion is east and west. B. Their direction of motion is north and east. C. Their direction of motion is south and north. D. Their direction of motion is north and west. E. Their direction of motion is south and east.
A. Their direction of motion is east and west.
What happens to parallel light rays that strike a concave lens? A. They diverge on refraction. B. They converge beyond the focal point on the other side of the lens. C. They converge at the focal point on the other side of the lens. D. They partially converge and partially diverge.
A. They diverge on refraction.
What is the distance from the crest to the equilibrium of a wave called? A. amplitude B. period C. frequency D. phase
A. amplitude
What is one way to increase the amplitude of a wave in a medium? A. by applying a vibration at the natural frequency of the medium B. by increasing the velocity of the wave source C. by moving the source of the wave away from the receptor, or observer D. by decreasing the frequency of the wave source
A. by applying a vibration at the natural frequency of the medium
Sound waves are converted finally into which of these signals in order to be processed by the brain? A. electrical signal waves B. pressure waves C. longitudinal waves D. high-frequency transverse waves E. low-frequency transverse waves
A. electrical signal waves
Which electromagnetic waves have the highest frequencies in the electromagnetic spectrum? A. gamma rays B. microwaves C. radio waves D. ultraviolet radiation
A. gamma rays
Which electromagnetic wave has wavelengths just longer than visible light? A. infrared radiation B. ultraviolet radiation C. microwaves D. radio waves
A. infrared radiation
A wave is propagating from left to right in a medium. The particles in the medium are also vibrating from left to right. What kind of wave does this describe? A. longitudinal wave B. transverse wave C. mechanical wave D. electromagnetic wave
A. longitudinal wave
When sound waves travel through a medium, the particles of the medium move parallel to the wave motion. Which type of wave displays this behavior? A. longitudinal waves B. transverse waves C. perpendicular waves D. electromagnetic waves
A. longitudinal waves
Which is a transverse wave that requires a medium to move? A. ocean wave B. sound wave C. light wave D. microwave
A. ocean wave
Which term describes the time it takes for an object to complete one full cycle of motion on a spring? A. period B. frequency C. amplitude D. time E. force
A. period
Which sequence shows the different types of electromagnetic waves arranged in an increasing order of their frequency? A. radio waves, microwaves, visible light, x-rays B. x-rays, visible light, microwaves, radio waves C. visible light, radio waves, x-rays, microwaves D. microwaves, x-rays, radio waves, visible light E. visible light, x-rays, radio waves, microwaves
A. radio waves, microwaves, visible light, x-rays
Which is a longitudinal wave that requires a medium to move? A. sound wave B. ocean wave C. lightwave D. radio wave E. microwave
A. sound wave
How do we calculate the restoring force according to Hooke's law? A. spring constant × displacement B. velocity × mass C. acceleration × length D. softness × mass
A. spring constant × displacement
What is the fundamental frequency of a particular medium? A. the lowest frequency at which a standing wave is possible B. the highest frequency at which a standing wave is possible C. the only frequency at which a standing wave is possible D. the only frequency at which a standing wave is not possible
A. the lowest frequency at which a standing wave is possible
When does resonance occur? A. when the frequency of a forced vibration equals the natural frequency B. when the frequency of a forced vibration is greater than the natural frequency C. when two waves of the same frequency interfere D. when two waves of slightly different frequencies interfere
A. when the frequency of a forced vibration equals the natural frequency
What is the frequency of a ship's whistle if the velocity of sound is 340 meters/second and the wavelength is 1.70 meters? A. 200 hertz B. 253 hertz C. 340 hertz D. 532 hertz
A.) 200 Hertz v = f × λf = v/λf = 340 m/s / 1.7 mf = 200 Hz
Both pendulum A and B are 3.0 m long. The period of A is T. Pendulum A is twice as heavy as pendulum B. What is the period of B?
B = T (same as A)
Imagine that you are swinging back and forth a chain with a locket on the end. Assuming that you are on Earth so that gravity is constant at 9.81 meters/second², and you know that the chain is 43 centimeters long, what is the period of this simple pendulum? A. 13 seconds B. 1.3 seconds C. 3.5 seconds D. 0.76 seconds
B. 1.3 seconds
A pure sound wave, generated by a tuning fork, is considered a periodic wave. Which statement is true for this tuning fork sound wave? A. The wave pattern repeats itself after every two waves. B. Every wave has the same wave pattern. C. The amplitude of the waves increases after every subsequent wave. D. No two waves have the same wave pattern.
B. Every wave has the same wave pattern.
The distance between a sound source and a listener is decreased to half the initial distance. What is the change in the amplitude of the sound heard? A. It decreases by half the initial amplitude. B. It increases by four times the initial amplitude. C. It decreases to one fourth the initial amplitude. D. It increases by two times the initial amplitude.
B. It increases by four times the initial amplitude.
A mass is stretched 4 centimeters from the equilibrium position of a spring. If the displacement is doubled, what can be concluded about the restoring force? A. It is halved. B. It is doubled. C. It stays the same. D. It is increased by 4. E. It is decreased by14
B. It is doubled. From Simple Harmonic Motion (SHM), the restoring force is given by: F = -ω²x We can see that restoring force is proportional to the displacement, x. So if the displacement x is doubled, then the restoring force will also be doubled.
Which statement is true about the loudness of sound? A. It is directly proportional to the distance of the listener from the source. B. It is inversely proportional to the square of the distance of the listener from the source. C. It is directly proportional to the square of the distance between the listener from the source. D. It is inversely proportional to the distance between the listener from the source.
B. It is inversely proportional to the square of the distance of the listener from the source.
Which statement is true of a convex lens? A. It is thicker at the edges and thinner at the center. B. It is thinner at the edges and thicker at the center. C. It is uniformly thick. D. It is uniformly thin.
B. It is thinner at the edges and thicker at the center.
Which statement about a wave produced by a doorbell is true? A. It does not require a medium to travel. B. It propagates in the form of compressions and rarefactions. C. The particles of the wave medium vibrate perpendicular to the direction of the wave. D. It propagates through crests and troughs.
B. It propagates in the form of compressions and rarefactions.
The sun generates both mechanical and electromagnetic waves. Which statement about those waves is true? A. The mechanical waves reach Earth, while the electromagnetic waves do not. B. The electromagnetic waves reach Earth, while the mechanical waves do not. C. Both the mechanical waves and the electromagnetic waves reach Earth. D. Neither the mechanical waves nor the electromagnetic waves reach Earth.
B. The electromagnetic waves reach Earth, while the mechanical waves do not.
Which statement best explains the relationship between the wavelengths and the frequencies of all the waves in the electromagnetic spectrum? A. The higher the frequency of the waves, the higher their wavelength is. B. The higher the frequency of the waves, the lower their wavelength is. C. The frequency of the waves is always the same as their wavelength. D. The wavelengths and frequencies of the waves do not affect each other.
B. The higher the frequency of the waves, the lower their wavelength is.
When an object is at a distance of twice the focal length from a concave lens, the image produced is virtual and smaller than the object. What happens to the image if the object is shifted closer to the lens to a point one focal length away from it? A. The image produced is virtual and enlarged. B. The image produced is virtual and smaller than the object. C. The image produced is real and enlarged. D. The image produced is real and smaller than the object. E. The image produced is virtual and of the same size as the object.
B. The image produced is virtual and smaller than the object.
When a pendulum is at the position all the way to the left when it is swinging (at the top of the arc), what is true of the kinetic and potential energy? A. The potential energy is zero, and the kinetic energy is maximized. B. The kinetic energy is zero, and the potential energy is maximized. C. Both the kinetic and potential energy are zero. D. Both the kinetic and potential energy are at their maximum. E. There is no energy at this position.
B. The kinetic energy is zero, and the potential energy is maximized.
What happens when light rays incident on a convex mirror run parallel to its principal axis? A. The reflected rays go parallel to the vertex. B. The reflected rays pass through the focal point. C. The reflected rays pass through the center of curvature. D. The reflected rays go parallel to the focal point.
B. The reflected rays pass through the focal point.
If the pitch of the sound coming out of a speaker increases, which statement is true about the sound wave? A. The wavelength increases. B. The wavelength decreases. C. The amplitude increases. D. The amplitude decreases.
B. The wavelength decreases.
An incident ray traveling in a slower medium strikes a boundary with a faster medium. What happens when its angle of incidence is greater than the critical angle? A. The refracted ray makes an angle of 90°. B. There is total internal reflection in the faster medium. C. There is total internal reflection in the slower medium. D. The reflected ray makes an angle of 90°. E. The reflected ray makes an angle equal to the critical angle.
B. There is total internal reflection in the faster medium.
Which statement demonstrates that ultraviolet (UV) rays are electromagnetic waves? A. They require a medium to travel. B. They don't require a medium to travel. C. The particles of the medium through which they travel vibrate perpendicularly to the direction of the wave. D. The particles of the medium through which they travel vibrate parallel to the direction of the wave. E. The particles in the medium through which they travel remain stationary.
B. They don't require a medium to travel.
Which statement is true for particles of the medium of an earthquake P-wave? A. They vibrate in a direction parallel to that of the wave, forming crests and troughs. B. They vibrate in a direction parallel to that of the wave, forming compressions and rarefactions. C. They vibrate in a direction perpendicular to that of the wave, forming crests and troughs. D. They vibrate in a direction perpendicular to that of the wave, forming compressions and rarefactions.
B. They vibrate in a direction parallel to that of the wave, forming compressions and rarefactions.
Which statement is true for the relationship between transported energy and the amplitude of the sound waves? A. With an increase in the amplitude, the energy of the sound decreases. B. With an increase in the amplitude, the energy of the sound increases. C. With an increase in the amplitude, there is no change in the energy of the sound. D. With an increase in the amplitude, the energy of the sound becomes zero.
B. With an increase in the amplitude, the energy of the sound increases.
The wavelengths for visible light rays correspond to which of these options? A. about the size of a pen B. about the size of a virus or a large molecule C. about the size of an amoeba D. smaller than an atom E. about the size of a football field
B. about the size of a virus or a large molecule
The height of a wave from the equilibrium is 1 meter. Which parameter of the wave does this distance represent? A. period B. amplitude C. frequency D. phase
B. amplitude
What do we get when two sound waves of slightly different frequencies interfere with each other? A. resonance B. beats C. standing waves D. first harmonic
B. beats
Which property of light remains unchanged when it enters a different medium? A. amplitude B. frequency C. wavelength D. velocity E. density
B. frequency
Which sequence shows all the colors of visible light arranged from shortest to longest wavelength? A. red, yellow, orange, blue, green, indigo, and violet B. red, orange, yellow, green, blue, indigo, and violet C. violet, indigo, blue, green, yellow, orange, and red D. violet, indigo, green, blue, orange, yellow, and red
B. red, orange, yellow, green, blue, indigo, and violet
Which sequence shows all the spectral colors of visible light arranged in an increasing order of their frequency? A. red, yellow, orange, blue, green, indigo, and violet B. red, orange, yellow, green, blue, indigo, and violet C. violet, indigo, blue, green, yellow, orange, and red D. violet, indigo, green, blue, orange, yellow, and red
B. red, orange, yellow, green, blue, indigo, and violet
Why do underwater objects appear distorted when you see them from above? A. reflection B. refraction C. diffusion D. diffused reflection E. specular reflection
B. refraction
Which of these factors will increase the speed of a sound wave in the air? A. wavelength B. temperature C. amplitude D. frequency E. period
B. temperature
What does the trough of a wave refer to? A. the highest point on the wave B. the lowest point of the wave C. the midline of the wave D. any random point on the wave
B. the lowest point of the wave
What is the refractive index of a medium? A. the ratio of the velocity of light in the medium over the velocity of light in a vacuum B. the ratio of the velocity of light in a vacuum over the velocity of light in the medium C. the ratio of the angle of incidence over the angle of refraction D. the ratio of the angle of refraction over the angle of incidence
B. the ratio of the velocity of light in a vacuum over the velocity of light in the medium
Which type of wall would make the best soundproofing for room? A. 1.0 centimeter thick glass B. two layers of 0.5 centimeter thick glass with 0.5 centimeters of air between them C. two layers of 0.5 centimeter thick glass with 0.3 centimeters of vacuum between them D. 1.0 centimeter thick steel
B. two layers of 0.5 centimeter thick glass with 0.5 centimeters of air between them
Which type of electromagnetic wave is invisible, but close to visible light, with wavelengths about the size of a virus or a large molecule (1 raise × 10-8 to 4 × 10-7 meters)? A. gamma rays B. ultraviolet rays C. microwaves D. radio waves E. infrared rays
B. ultraviolet rays
What kind of image is formed when an object is placed between the focal point and the vertex on the principal axis of a concave mirror? A. real, inverted, and smaller B. virtual, upright, and larger C. real, inverted, and the same size D. virtual, upright, and the same size E. real, upright, and smaller
B. virtual, upright, and larger
If the pitch of the sound coming out from a speaker increases, which is true about the sound wave? A. wavelength increases B. wavelength decreases C. amplitude increases D. amplitude decreases
B. wavelength decreases
As the mass oscillates on a spring, when is displacement at its maximum and velocity equal to zero? A. when it is partially compressed B. when it is at the equilibrium position C. when it is fully stretched D. when it is at near rest
B. when it is at the equilibrium position
What is a necessary condition for total internal reflection in a medium? A. when the angle of incidence is equal to the critical angle B. when the angle of incidence is greater than the critical angle C. when the angle of refraction is equal to the critical angle D. when the angle of reflection is less than the critical angle
B. when the angle of incidence is greater than the critical angle
Microwaves are electromagnetic waves used in broadcasting and telecommunications. When do these waves increase in frequency? A. when the source moves away from you B. when the source moves toward you C. when you move away from the source D. when you move away from the source and the source moves away from you
B. when the source moves toward you
A ball swinging at the end of a massless string, as shown in the figure, undergoes simple harmonic motion. At what point (or points) is the magnitude of the instantaneous acceleration of the ball the greatest? A) A and B B) B C) A and D D) C E) A and C
C) A and D
What is the refractive index of a solution that has a critical angle of 40.8° with respect to air? The refracting index of air is 1.00. A. 1.17 B. 1.25 C. 1.53 D. 1.65
C. 1.53
The frequency of a given region of the electromagnetic spectrum ranges from 3 × 1016 − 3 × 1019 hertz. Which type of wave is found in this region? A. x-rays B. ultraviolet rays C. infrared waves D. radio waves
C. infrared waves
Besides the force due to gravity or g, what else determines the period of a pendulum? A. tension of the cord B. mass of the pendulum bob C. length of the cord D. amplitude of the swing E. Only gravity is important when calculating the period of a pendulum.
C. length of the cord
What will the angle of refraction be for a ray of light passing from air into a sodium chloride crystal if the angle of incidence is 60.0°? The index of refraction of sodium chloride is 1.53. A. 13° B. 22° C. 34° D. 42° E. 48°
C. 34° Using Snell's Law: n1 * sin(theta1) = n2 * sin(theta2) where n1 is the refractive index of the incident light (n1 = 1 in this case) theta1 is the angle of incidence n2 is the refractive index of the material that the light is entering (n2 = 1.53 in this case) theta2 is the angle of refraction n1 * sin(theta1) = n2 * sin(theta2) becomes 1 * sin(60) = 1.53 * sin(theta2) or 1 * 0.866 = 1.53 * sin(theta2) 0.866 = 1.53 * sin(theta2) sin(theta2) = 0.866 / 1.53 = 0.566 theta2 = arcsin(0.566) = 34 degrees (the angle of refraction)
What is the force applied by a spring as it stretches upward 0.25 meters and has a k value of 25 newtons per meter? A. 1 newton B. 5.5 newtons C. 6.3 newtons D. 10 newtons E. 50 newtons
C. 6.3 newtons F=kx=(25)(0.25) = 6.3 N
The refractive index of medium A is 1.54 and that of medium B is 2.12. Which statement is correct about this information? A. ray of light passing from medium A to B can undergo total internal reflection. B. A ray of light passing from medium A to B will bend away from the normal. C. A ray of light passing from medium A to B will bend toward the normal. D. A ray of light passing from medium A to B can make a critical angle.
C. A ray of light passing from medium A to B will bend toward the normal.
What is the relationship between the frequency and the pitch of a sound? A. As the frequency of a sound increases, the pitch decreases. B. As the frequency of a sound decreases, the pitch becomes zero. C. As the frequency of a sound decreases, the pitch decreases. D. Frequency and pitch are independent of each other.
C. As the frequency of a sound decreases, the pitch decreases.
What do microwaves have in common with light waves? A. Both are compression waves. B. Both are longitudinal waves. C. Both are electromagnetic waves. D. Both are mechanical waves.
C. Both are electromagnetic waves.
Kevin is standing outside a railway station. He can know whether a train is approaching the station or departing from the sound it makes. Which principle of sound waves is he using? A. resonance B. beats C. Doppler effect D. interference
C. Doppler effect
Which statement is true about the electromagnetic spectrum? A. The visible spectrum includes radio waves, light, and gamma rays. B. The colors you can see have the same wavelength. C. It has a range of visible and invisible forms of radiation. D. The waves travel at the speed of 2.998×105 meters/second.
C. It has a range of visible and invisible forms of radiation.
What best describes why the critical angle of an air-glass boundary is 39.3°? A. It is the angle of refraction in glass for which the angle of incidence in air is 90°. B. It is the angle of incidence in air for which the angle of refraction in glass is 90°. C. It is the angle of refraction in air for which the angle of incidence in glass is 90°. D. It is the angle of incidence in glass for which the angle of refraction in air is 90°.
C. It is the angle of refraction in air for which the angle of incidence in glass is 90°.
The light incident on a smooth reflecting surface undergoes specular reflection. The angle of reflection is 55°. What can you say about the angle of incidence? A. It's greater than 55°. B. It's less than 55°. C. It's equal to 55°. D. It could be any angle between 0° to 90°.
C. It's equal to 55°.
What happens as a result of an increase in the intensity of a sound wave? A. The frequency of the sound wave increases. B. The velocity of the sound wave decreases. C. The energy of the sound wave increases. D. The amplitude of the sound decreases.
C. The energy of the sound wave increases.
Which statement describes the velocity of a mass oscillating on a spring? A. The velocity is constant throughout the motion. B. The velocity remains the same throughout the motion. C. The velocity is zero at the maximum displacement. D. The velocity is greatest at the maximum position. E. The velocity is least at the equilibrium position.
C. The velocity is zero at the maximum displacement.
What happens when a blaring siren moves away from you? A. The speed of sound decreases. B. The speed of sound increases. C. The wavelength of sound increases. D. The wavelength of sound decreases.
C. The wavelength of sound increases.
When are the displacement and acceleration equal to zero for the motion of a mass on a spring? A. at maximum displacement B. at minimum displacement C. at the equilibrium position D. at a displacement of 2x E. at a displacement of 1/3x
C. at the equilibrium position
Where should an object be placed in front of a concave mirror's principal axis to form an image that is real, inverted, larger than the object, and farther from the mirror than the object is? A. at the focal point on the principal axis B. at the center of curvature on the principal axis C. between the center of curvature and focal point on the principal axis D. between the focal point and the vertex on the principal axis
C. between the center of curvature and focal point on the principal axis
Which pair of features best characterizes a sound wave? A. crests and compressions B. crests and troughs C. compressions and rarefactions D. rarefactions and troughs
C. compressions and rarefactions
What quantity measures the number of complete cycles an oscillation makes per second? A. period B. amplitude C. frequency D. force
C. frequency
Which sequence shows electromagnetic waves arranged in a decreasing order of their wavelengths? A. visible light, gamma rays, infrared rays, x-rays, ultraviolet rays B. infrared rays, visible light, ultraviolet rays, x-rays, gamma rays C. gamma rays, x-rays, ultraviolet rays, visible light, infrared rays D. ultraviolet rays, visible light, gamma rays, x-rays, infrared rays
C. gamma rays, x-rays, ultraviolet rays, visible light, infrared rays
An object is placed so that the image formed is a real image of the same size as the object. What is the position of the object? A. at the focal point B. at a distance of twice the focal length C. greater than the focal length but less than twice the focal length D. at a distance less than the focal length
C. greater than the focal length but less than twice the focal length
What is the unit for frequency? A. newtons B. seconds C. hertz D. micrometers
C. hertz
If an object is placed at twice the focal length of a convex lens, which type of image will be produced? A. real, upright, and of the same size B. virtual, inverted, and smaller C. real, inverted, and of the same size D. virtual, upright, and magnified E. real, inverted, and magnified
C. real, inverted, and of the same size
If an object is placed at a distance greater than twice the focal length of a convex lens, what type of an image will be produced? A. real, upright, and enlarged B. virtual, inverted, and small C. real, inverted, and small D. virtuaI, upright, and enlarged
C. real, inverted, and small
Which behavior of light makes it possible for you to see a spectrum of colors in a spray of water on a sunny day? A. diffusion B. reflection C. refraction D. dispersion
C. refraction
According to the Hooke's law formula, the force is proportional to what measurement? A. the length of the spring B. the mass of the spring C. the displacement of the spring D. the period of the spring
C. the displacement of the spring
In Hooke's law, what does the x represent? A. the thickness of the spring B. the length of the spring C. the displacement of the spring D. the distance from stretched to compressed E. the equilibrium distance
C. the displacement of the spring
In addition to gravity, what is the other predominant force that affects the motion of a pendulum? A. the force of friction B. the force of tension C. the force of air resistance D. the restoring force E. the normal force
C. the force of air resistance
Under which condition does a light ray striking a concave mirror reflect off parallel to the principal axis? A. when the incident ray passes from a point anywhere between the center of curvature and the focal point B. when the incident ray passes through the center of curvature C. when the incident ray passes through the focal point D. when the incident ray passes through a point beyond the center of curvature E. when the incident ray passes through a point anywhere between the focal point and the vertex
C. when the incident ray passes through the focal point
When is the magnitude of the acceleration of a mass on a spring at its maximum value? A. when the mass has a speed of zero B. when the mass is moving upward C. when the mass has no displacement D. when the mass is 1 2
C. when the mass has no displacement
If you know that the period of a pendulum is 1.87 seconds, what is the length of that pendulum? (Assume that we are on Earth and that gravity is 9.81 meters/second². ) A. 0.87 centimeters B. 2.1 meters C. 1.6 meters D. 0.87 meters E. 8.3 meters
D. 0.87 meters
What is the refractive index of a medium when the light strikes the medium after traveling through air at an angle of 23.3° and the refracted angle is 14.6°? A. 1.33 B. 1.36 C. 1.44 D. 1.57 E. 1.91
D. 1.57 Refractive index = sin θ (air) / sin θ (medium) = sin 23.3 / sin 14.6 = 1.57
James wants to lower the pitch coming from an electronic sound generator. How would he achieve that? A. He should increase the amplitude. B. He should increase the frequency C. He should decrease the amplitude. D. He should decrease the frequency. E. He should increase the intensity.
D. He should decrease the frequency
What is true about the refractive index of a medium? A. It increases with an increase in angle of incidence. B. It decreases with a decrease in angle of refraction. C. It decreases with an increase in angle of incidence. D. It is independent of any change in angle of incidence or angle of refraction. E. It increases with a decrease in angle of refraction.
D. It is independent of any change in angle of incidence or angle of refraction.
Sound waves are mechanical waves. Which statement is true for this type of wave? A. Sound waves transport their energy through a vacuum. B. Particles of the medium are displaced completely from their initial positions, moving along with the wave front. C. Particles of the medium move perpendicular to the direction of the energy transport. D. Sound waves require a medium in order to transport energy.
D. Sound waves require a medium in order to transport energy.
Why is the restoring force in Hooke's law a negative value? A. The force is opposite the displacement. B. The force is smaller than the displacement. C. The force is larger than the displacement. D. The force is in the direction of the displacement.
D. The force is in the direction of the displacement.
Which of these events is an example of the Doppler shift? A. The amplitude of a wave on a string increases as the frequency decreases. B. The amplitude of sound from a tuning fork decreases due to damping. C. The frequency of light from a star increases as it moves toward us. D. The intensity of an electromagnetic wave increases with the field strength. E. The velocity of an electromagnetic wave changes as its medium changes.
D. The intensity of an electromagnetic wave increases with the field strength.
An object is placed in front of a concave lens, beyond it's focal point. What can you say about images formed by this concave lens? A. They are always virtual. B. They always form behind the lens. C. They are always real. D. They are always larger than the object.
D. They are always larger than the object.
How do the tension of the cord and the force of gravity affect a pendulum? A. They are the competing forces that act on a pendulum as it swings. B. They are the two factors that affect the period of a pendulum. C. They determine what type of pendulum it will be. D. They have no effect on a pendulum.
D. They have no effect on a pendulum.
At what distance from a convex lens must an object be to get a virtual image? A. at the focal point B. at more than twice the focal length C. greater than the focal length and but less than twice the focal length D. at a distance less than the focal length
D. at a distance less than the focal length
Light rays from an object after passing through a convex lens form an image at the focal point behind the lens (opposite side of the object). What is the actual position of the object? A. at the focal point in front of the lens B. at twice the focal length C. between the focal point and twice the focal length D. at a great distance, effectively infinite E. between the focal point and the lens
D. at a great distance, effectively infinite
Light incident on a surface at an angle of 45° undergoes diffused reflection. At what angle will it reflect? A. only at angles less than 45° B. only at angles greater than 45° C. only at 45° D. at any angle between -90° and 90° E. only at 0°
D. at any angle between -90° and 90°
A periodic wave has a fixed pattern that is repeated. What is one completion of the wave pattern called? A. period B. frequency C. amplitude D. cycle E. phase
D. cycle
The potential energy for a mass on a spring is proportional to the square of which of these quantities? A. mass B. frequency C. period D. displacement E. velocity
D. displacement
Where should you place an object on the principal axis in front of a convex mirror to get a virtual, upright, and smaller image? A. anywhere on the principal axis B. only at the focal point on the principal axis C. only between the center of curvature and the focal point on the principal axis D. only between the focal point and the vertex on the principal axis E. only at the center of curvature on the principal axis
D. only between the focal point and the vertex on the principal axis
What is the focal length of a lens? A. the distance between the object and the image B. distance between the object and the center of the lens C. the distance between the center of the lens and the image D. the distance between the focal point and the center of the lens
D. the distance between the focal point and the center of the lens
How many nodes are in the standing wave along the wire in the given figure? A. zero B. one C. two D. three
D. three
Which sequence shows electromagnetic waves arranged from shorter to longer wavelengths? A. visible light, infrared radiation, microwaves, and ultraviolet rays B. infrared radiation, visible light, ultraviolet radiation, and microwaves C. microwaves, infrared radiation, visible light, and ultraviolet radiation D. ultraviolet radiation, visible light, infrared radiation, and microwaves
D. ultraviolet radiation, visible light, infrared radiation, and microwaves
If an object is placed between a convex lens and its focal point, which type of image will be produced? A. real, inverted, and magnified B. real, upright, and smaller C. virtual, inverted, and magnified D. virtual, upright, and magnified E. real, inverted, and smaller
D. virtual, upright, and magnified
The distance between two consecutive crests is 2.5 meters. Which characteristic of the wave does this distance represent? A. amplitude B. frequency C. period D. wavelength E. phase
D. wavelength
Which property of the sound wave undergoes a change with an increase in its energy? A. frequency B. velocity C. amplitude D. wavelength
D. wavelength
C.3 Given initial conditions, write appropriate equations for displacement, velocity, and acceleration as sinusoidal functions of time for an object undergoing SHM if the amplitude and angular velocity of the motion are known.
Displacement Velocity Acceleration (Know Amplitude and Angular Velocity)
What do ocean waves and sound waves have in common? A. Both are transverse waves. B. both are longitudinal waves C. Both are electromagnetic waves. D. Both exhibit the same particle-to-particle interaction. E. Both are mechanical waves.
E. Both are mechanical waves.
What do slinky waves and seismic waves have in common? A. They both always occur as transverse waves. B. They both always occur as longitudinal waves. C. Both are electromagnetic waves. D. Both exhibit the same particle-to-particle interaction. E. Both are mechanical waves.
E. Both are mechanical waves.
Which statement is true of a wave that's propagating along the pavement and girders of a suspension bridge? A. The wave is mechanical, with particles vibrating in a direction that is parallel to that of the wave, forming compressions and rarefactions. B. The wave is electromagnetic, with particles vibrating in a direction that is parallel to that of the wave, forming compressions and rarefactions. C. The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming crests and troughs. D. The wave is electromagnetic, with particles vibrating in a direction that is perpendicular to that of the wave, forming crests and troughs. E. The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming compressions and rarefactions.
E. The wave is mechanical, with particles vibrating in a direction that is perpendicular to that of the wave, forming compressions and rarefactions.
Which type of mirror produces images that are always upright and at the same distance from the mirror as the object is? A. concave mirror B. convex mirror C. spherical mirror D. parabolic mirror E. flat mirror
E. flat mirror
The frequency of which type of electromagnetic wave is just higher than that of visible light? A. infrared waves B. gamma rays C. x-rays D. radio waves E. ultraviolet rays
E. ultraviolet rays
Figure 11-2 is a "snapshot" of a wave at a given time. The frequency of the wave is 120 Hz. What is the wavelength?
F=120 Hz L = 0.20
Figure 11-2 is a "snapshot" of a wave at a given time. The frequency of the wave is 120 Hz. What is the wave speed?
F=120 Hz v = (0.20)(120) = 24 m/s
What is the intensity in watts per meter squared of 85.0 dB sound?
Given: B = 85.0 db Find: Intensity (I) Formula: B = 10 log (I/Io) I = Io 10 ^(B/10) Io (default) = 1 x 10-12 I = 3.2 x 10-4
The warning tag on a lawn mower states that it produces noise at a level of 91.0 dB. What is this in watts per meter squared?
Given: B =91.0 db Find: watts/m2 = Intensity (I) I = Io 10 ^(B/10) Io (default) = 1 x 10-12 I = 1.26 x 10-3
Find ratio of intensities for first sound 30 dB and second sound 10 dB
Given: B1 = 30 dB B2 = 10 dB Find: I1 = ? I2 = ? I = Io 10 ^(B/10) Io (default) = 1 x 10-12 I1 = 1.0 x 10-9 I2 = 1 x 10-11 Ratio = I1/I2 = (1.0 x 10-9)/(1.0 x 10-11) = 100 w/m2
Find the length of an organ pipe closed at one end that produces a fundamental frequency of 256 Hz when air temperature is 18.0 oC.
Given: Closed at One End f = 256 Hz T = 18 oC Find: L = ? Formula: V(w) = 331 m/s sqrt(T/273 k) T = 18 + 273 = 291 K V(w) = 331 sqrt(291/273) = 341.7 m/s Formula: f(1) = n(V/4L) --> L = V/4f(1) L = (341.7/(4)(256) = 0.334 m
The position of a mass that is oscillating on a spring is given by x=(18.3cm)cos((2.35s-1)t). What is the frequency of this motion? What is the Amplitude of this motion? What is the period?
Given: Displacement x=(18.3cm)cos((2.35s-1)t) Find: f, A, T = ? Formula: x(t) = A cos wt w = 2*pi*f -> f = w/2*pi From x=(18.3cm)cos((2.35s-1)t) --> A = 18.3 w= 2.35 1) Frequency f = w/2*pi = (2.35)/2*3.14 = 0.374 Hz 2) Amplitude = 18.3 cm 3) Period T = 1/f = 1/0.374 = 2.67
What sound intensity level in dB is produced by earphones that create an intensity of 4.00 x 10−2 watts/m2?
Given: I= 4.00 x 10-2 Find: B (db) B = 10 log (I/Io) Io (default) = 1 x 10-12 B = 106.02 dB
(a) What is the fundamental frequency of a 0.672 m long tube, open at both ends, on a day when the speed of sound is 344 m/s? b)What is the frequency of its second harmonic?
Given: L = 0.672 m v=3.44 m/s open at both ends Find: f1 = ? f2 = ? Formula: f(n) = n (V/2L) where n = 1, 2, 3 (open both ends) a) f1 = 1 (V/2L) = 1 (3.44/2(0.672)) = 2.56 Hz b) f2 = 2(V/2L) = 2(3.44/2(0.672)) = 5.12 Hz
What length should an oboe have to produce a fundamental frequency of 110 Hz on a day when the speed of sound is 343 m/s? It is open at both ends.
Given: Open at BOTH ends f=110 Hz v=343 m/s n = 1 Find: L = ? Formula: f(n) = (nV)/2L --> L = (nV)/2f L = (1)(343)/2(110) = 1.6 m
A type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. What force constant is needed to produce a period of 0.500 s for a 0.0150-kg mass?
Given: Period T=0.500s m=0.0150 kg Find: force constant (k) Formula: T = 2pi sqrt(m/k) --> k = (m)/(I/2p)^2 k = (0.0150)/(0.500/2pi)^2 = 2.37 N/M
Given period 4.00 and time 0.00 s and velocity - 0 and displacement = 8 cm. a) Write sinusoidal expression b)
Given: T = 4.00 t=0.00 s v=0 x = 8 cm (Amplitude) Find: sinusoidal expression; displacement at t=2.0 s Formula: x = A cos wt w=2*pi/T a) w= 2*pi/4 = 0.5pi x = 8 cos(0.5pi)t b) x(2.0 sec) --> x = 8 cos(0.5pi)2 = -8 cm
If the frequency of a wave is 60.0 Hz, what is the period?
Given: f = 60.0 Hz Find: Period (T) Formula: T = 1/f T = 1/60 = 0.0166 = 1.6 x 10-2
A "showy" custom-built car has two brass horns that are supposed to produce the same frequency but actually emit 263.8 and 264.5 Hz. What beat frequency is produced?
Given: f1 = 263.8 Hz f2 = 264.5 Hz Find: Beat Frequency Formula: f(beat) = | f1 - f2 | f(beat) = | 263.8 - 264.5 | f(beat) = 0.7 Hz
If a wind instrument, such as a tuba, has a fundamental frequency of 32.0 Hz, what are its first three overtones? It is closed at one end. (The overtones of a real tuba are more complex than this example, because it is a tapered tube.)
Given: f1 = 32.0 Hz n = 1,3,5,7 tube closed at one end Find: f3, f5, f7 = ? Formula: f(n) = n (V/4L) where n = 3,5,7 (closed at one end) f3 =3 (V/4L) = 3*f1 = 3(32.0) = 96.0 Hz <-- 1st overtone f5 =5 (V/4L) = 5*f1 = 5(32.0) = 160 Hz <-- 2nd overtone f7 =7 (V/4L) = 7*f1 = 7(32.0) = 224 Hz <-- 3rd overtone
If the spring in simple harmonic constant is 10 N/m and the object has a mass of 0.10 kg, and speed is 1.0 m/s at equilibrium, determine (a) total energy and b) Amplitude.
Given: m=0.10 kg k=10 N/M v=1.0 m/s Find: a) total energy b) amplitude Formula: E = (0.5) kA^2 E(total) = (0.5) mv^2 a) E(total) = (0.5) mv^2 = (0.5) (0.10)(1.0)^2 = 0.050 b) E = (0.5) kA^2 --> A = sqrt(E/(0.5)k) A = sqrt(0.50/(0.5)(10) = 0.10
A mass of 0.250 kg is attached to a spring and undergoes simple harmonic oscillations with a period of 0.640 s. What is the force constant of the spring?
Given: m=0.250 kg simple harmonic oscillation T=0.640s Find: Constant k=? Formula: T = 2pi sqrt(m/k) --> k = (m)/(I/2p)^2 k = (0.250)/(0.640/2pi)^2 = 24.09 N/M
If the spring in simple harmonic constant is 20 N/m and the object has a mass of 0.50 kg, and speed is 1.5 m/s at equilibrium, determine (a) total energy and b) Amplitude.
Given: m=0.50 kg k=20 N/M v=1.5 m/s Find: a) total energy b) amplitude Formula: E = (0.5) kA^2 E(total) = (0.5) mv^2 a) E(total) = (0.5) mv^2 = (0.5) (0.50)(1.5)^2 = 0.563 b) E = (0.5) kA^2 --> A = sqrt(E/(0.5)k) A = sqrt(0.563/(0.5)(20) = 0.237
A 51.8-kg bungee jumper jumps off a bridge and undergoes simple harmonic motion. If the period of oscillation is 11.2 s, what is the spring constant (force constant) of a bungee cord? A) 16.3 N/m B) 19.6 N/m C) 26.1 N/m
Given: m=51.8 kg simple harmonic oscillation T=11.2 s Find: Constant k=? Formula: T = 2pi sqrt(m/k) --> k = (m)/(I/2p)^2 k = (51.8)/(11.2/2pi)^2 = 16.3 N/M
What is the intensity level of a sound with intensity 10 -3 W/m 2?
I = 10 log (10^-3/10^-12) = 10log(10^9) = 90 db
The pendulum of a grandfather clock is 1.0 m long. What is its period on the Earth?
L = 1.0 g = 9.8 T = (2pi)sqrt(L/g) = 2(3.14)sqrt(1/9.8) = 2.05
The pendulum of a grandfather clock is 1.0 m long. What is its period on the Moon where the acceleration due to gravity is only 1.7 m/s 2?
L = 1.0 m g = 1.7 m/s2 T = (2pi)sqrt(L/g) = 2 (3.14) sqrt(1/1.7) = 4.818 s
What is the frequency of a 2.5 m wave traveling at 1400 m/s?
L = 2.5 m v=1400 m/s v = f(lamda) f = v/(lamda) = (1400/2.5) = 560 Hz
An organ pipe open at both ends has a length of 0.80 m. If the velocity of sound in air is what is the frequency of the second harmonic?
L=0.80 v = 340 m/s n = 2 (2nd harmonic) f = (nv)/2L = (2)(340)/(2)(0.80) = 425 Hz
C.1 Write equations for the period, linear frequency and angular frequency for a system undergoing SHM such as a simple pendulum or a mass attached to a spring.
Period: Linear Frequency Angular Frequency
C.2 Describe the relationship between the speed of sound, its frequency, and its wavelength.
Speed of sound frequency wavenlength
A pendulum has a period of 2.0 s on Earth. What is its length?
T = 2.0 g = 9.8 L = (T^2/4pi^2)g = ((2^2)/4pi^2)*9.8 = (4/4pi^2)* 9.8 L = (4/39.47)* 9.8 = 0.99
What is the period of a wave with a frequency of 1500 Hz?
T = period f = 1500 Hz T = (1/f) = (1/1500) = 0.66 ms
A 3.00-m long pipe is in a room where the temperature is 20°C. What is the fundamental frequency if the pipe is open at both ends?
TBD
A sound wave has a velocity of 350 meters/second and a frequency of 430 hertz. What is its wavelength? A. 0.01 meters B. 0.60 meters C. 0.81 meters D. 0.08 meters
Velocity of the sound wave = 350 meters/secondFrequency of the sound wave = 430 Hertz Wavelength = speed / frequency = 350/430 = 0.81
When are beats generated in two interfering waves? A. when they have slightly different velocities B. when they have the same wavelength C. when they have slightly different frequencies D. when they have the same amplitude E. when they have slightly different amplitudes
When they have slightly different frequencies. This is because they will fall into and out of phase, leading to constructive and then destructive interference. This change in interference causes a pulsating nature to the volume that is called beating
When the reflection of an object is seen in a plane mirror, the image is: a. virtual and inverted. b. virtual and upright. c. real and upright. d. real and inverted.
b. virtual and upright.
Two tunes have frequencies of 440 Hz and 444 Hz. What is the beat frequency?
beat frequency = |f1 - f2| beat frequency = |440-444| = 4 Hz
The wavelengths of the sounds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/s?
beat frequency = |f1 - f2| f = (v/lamda) beat frequency = |(v1/lamda) - (v2/lamda)| beat frequency = |(340/6) - (340/7)| beat frequency = 8 Hz
Figure 11-2 is a "snapshot" of a wave at a given time. The frequency of the wave is 120 Hz. What is the amplitude?
displacement = 0.10 m (max on figure)
A 4.0-kg object is attached to a spring of spring constant 10 N/m. The object is displaced by 5.0 cm from the equilibrium position and let go. What is the frequency of vibration?
k = 10 N/M displaced L = 5.0 cm f = 1/T T = 1/2pi(L/
State and identify the units of fundamental quantities of time and length and formulate the units of derived quantities such as velocity, acceleration
output
When is the velocity of a mass on a spring at its maximum value? A. when the mass has a displacement of zero B. when the mass is moving downward C. when the mass has maximum acceleration D. when the mass is at rest
sdfsd
What is the velocity of a wave that has a wavelength of 3.0 m and a frequency of 12 Hz?
v = velocity f = 12 Hz lambda = 3.0 v = (lambda)(f) = (3.0)(12) = 36 m/s
What is the wave speed if a wave has a frequency of 12 Hz and a wavelength of 3.0 m?
wave speed = v = velocity f = 12 Hz lambda = 3.0 v = (lambda)(f) = (3.0)(12) = 36 m/s
The refractive index of water is greater than that of air but is less than that of glass or a diamond. Under which condition can there be total internal reflection in water? A. when light travels from air to water B. when light travels from water to glass C. when light travels from water to air D. when light travels from water to a diamond
when light travels from water to air
A mass vibrates back and forth from the free end of an ideal spring of spring constant 20 N/m with an amplitude of 0.30 m. What is the kinetic energy of this vibrating mass when it is 0.30 m from its equilibrium position?
zero
