Unit 8 Physics

Two waves arrive at the same place at the same time exactly out of step with each other (a crest hits a trough). Each wave has an amplitude of 2.5 m. The resulting wave has an amplitude of A 0 m B 1.3 m C 2.5 m D 5.0 m E 10.0 m

0 m

The period of an ocean wave is 10 seconds. What is the wave's frequency? A 20 Hz B 10 Hz C 1.0 Hz D 0.5 Hz E 0.1 Hz

0.1 Hz

A weight on the end of a spring bobs up and down one complete cycle every 4.0 seconds. Its frequency is A 0.25 Hz B 4.0 Hz C none of the above

0.25 Hz

A 680-Hz sound wave travels at 340 m/s in air, with a wavelength of A 0.5 m B 5 m C 50 m D 500 m E none of the above

0.5 m

A certain ocean wave has a frequency of 0.05 Hz and a wavelength of 10 meters. What is the wave's speed? A 200 m/s B 10 m/s C 0.5 m/s D 0.05 m/s E 0.005 m/s

0.5 m/s

A certain ocean wave has a frequency of 0.07 Hz and a wavelength of 10 meters. What is the wave's speed? A 0.07 m/s B 0.70 m/s C 1.0 m/s D 10 m/s E 143 m/s

0.70 m/s

The frequency of the second hand on a clock is A 1/60 hertz B 1 Hz C 60 Hz

1/60 hertz

Compared to a sound of 10 dB, a sound of 50 dB has A 40 times the intensity B 400 times the intensity C 10,000 times the intensity

10,000 times the intensity

One object makes a sound of 20 dB. A second object object makes a sound of 60 dB. How many times greater is the intensity of the sound wave? A 3 x's B 40 x's C 100 x's D 10,000 x's E none of the above

10,000 x's

The threshold of pain and where hearing damage can begin to occur is around A below 20 dB B around 100 dB C greater than 20,000 dB

100 dB

One sound wave produced a sound of 30 dB. Another produces a sound of 60 dB. How many times greater is its intensity? A 2 x's B 30 x's C 100 x's D 1000 x's E none of the above

1000 x's

Suppose you sound a 1054 Hz tuning fork at the same time you play a piano string. You hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What was the original frequency of the piano string? A 1052 Hz B 1056 Hz C 1057 Hz D 1058 Hz E 1059 Hz

1056 Hz

A 1134-Hz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string? A 1131 Hz B 1134 Hz C 1137 Hz D 2268 Hz E 1131 or 1137 (not enough information to determine)

1131 or 1137 (not enough information to determine)

A sound wave that has a wavelength of 2 m in room-temperature air has a frequency of about (The speed of sound in air is about 340 m/s) A 170 Hz B 1360 Hz C 2040 Hz D none of the above

170 Hz

The amplitude of a particular wave is 1 meter. The top-to-bottom distance of the disturbance is A 0.5 m B 1 m C 2 m D none of the above

2 m

The average human range of hearing is between A 10 - 120 Hz B 20 - 50000 Hz C 10 - 100000 Hz D 20 - 20,000 Hz E 0 - 120 Hz

20 - 20,000 Hz

Sounds that are ultrasonic are sounds above A 20,000 Hz B 10,000 Hz C 5000 Hz D 120 Hz E 20 Hz

20,000 Hz

A skipper on a boat notices wave crests passing the anchor chain every five seconds. The skipper estimates the distance between the crests at 15 m. What is the speed of the water waves? A 3 m/s B 5 m/s C 15 m/s D not enough information

3 m/s

Beats are produced when two tuning forks, one of frequency 240 Hz and the other of frequency 246 Hz are sounded together. The frequency of the beats is A 6 Hz B 12 Hz C 240 Hz D 245 Hz E none of the above

6 Hz

A cork floating in a pool oscillates up and down three complete cycles in 1 second as a wave passes by. The wave's wavelength is 2 meters. What is the wave's speed? A 1 m/s B 2 m/s C 6 m/s D 12 m/s E more than 12 m/s

6 m/s

Beats are produced when two tuning forks, one of frequency 240 Hz and the other of frequency of 248 Hz are sounded together. The frequency of the beats is A 8 Hz B 16 Hz C 240 Hz D 247 Hz E none of the above

8 Hz

The amplitude of a particular wave is 4.0 m. The top-to-bottom distance of the disturbance is A 2.0 m B 4.0 m C 8.0 m D none of the above

8.0 m

Where can you touch a standing wave on a rope without disturbing the wave? A At a node B at an antinode C any place along the wave

At a node

Frequency and Period are directly proportional to one another A True B False

False

The unit for frequency

Hertz

Sound waves transfer energy through the air to the eardrum A. True B. False

True

Unlike a transverse wave, a longitudinal wave has no A amplitude B frequency C wavelength D speed E a longitudinal wave has all of the above

a longitudinal wave has all of the above

What happens when an airplane is flying faster than the speed of sound? A shockwave is produced B It becomes very quiet inside the plane C There is no sound produced by the plane D There is no sonic boom

a shockwave is produced

Sound waves cannot travel in A air B water C steel D a vacuum E sound can travel in all of the above

a vacuum

An example of a bow wave is A a shock wave behind a plane B a wave a surfer rides as it crashes on the shore C a wake behind a boat D a radio wave E a sound wave

a wake behind a boat

Sound waves in air are a series of A molecules that move closer and further apart B periodic compressions and rarefactions C high and low pressure regions D all of the above E none of the above

all of the above

Standing waves can be set up A in organ pipes B by blowing across the top of a soda bottle C on strings of musical instruments D all of the above E none of the above

all of the above

The Doppler effect applies to A sound waves B water waves C light waves D radio waves E all of the above

all of the above

Resonance occurs when A sound changes speed in going from one medium to another B sound makes multiple reflections C the amplitude of a wave is amplified D an object is forced to vibrate at its natural frequency E all of the above

an object is forced to vibrate at its natural frequency

In a standing wave, the crests occur here

anti-node

A periodic change in loudness caused by the interference of slightly differing frequencies

beats

Which of the following could result in hearing damage? A being exposed to a sound at 15,000 Hz B being exposed to a sound traveling 250 m/s C being exposed to a sound of 120 dB D all of the above will result in hearing damage

being exposed to a sound of 120 dB

Our brain will perceive a soundwave with a larger amplitude as Answer A having a higher pitch B being louder C as having a richer, fuller sound

being louder

A Doppler effect occurs when a source of sound moves A toward you B away from you C both of the above D none of the above

both of the above

When crests or troughs overlap and the result is an increase in amplitude

constructive interference

The tallest point on a wave

crest

As the sound of a car's horn passes and recedes from you, the pitch of the horn seems to A increase B decrease C stay the same

decrease

Noise-canceling earphones are an example of A constructive interference B destructive interference C beats D resonance

destructive interference

Sometimes there are "deadspots" in an auditorium because of A constructive interference of sound waves B destructive interference of sound waves C the Doppler effect D standing waves

destructive interference of sound waves

The change in frequency of a wave due to the motion of the source or observer

doppler effect

The number of cycles in a given time period

frequency

What determines the pitch of a sound? A amplitude B combination of harmonics C resonance D frequency E beats

frequency

Two waves arrive at the same time and place exactly in step with each other. Each wave has an amplitude of 1m. The resulting wave has an amplitude of A greater than 1 m B less than 1 m C 1 m

greater than 1m

An observer on the ground hears a sonic boom which is created by an airplane flying at a speed A just below the speed of sound B equal to the speed of sound C greater than the speed of sound D any of the above speeds

greater than the speed of sound

Beats can be heard when two tuning forks A are sounded together B have the same frequency and are sounded together C have almost the same frequency and are sounded together D all of the above E none of the above

have almost the same frequency and are sounded together

Suppose a bug is jiggling up and down and swimming towards you at the same time. Compared to the frequency at which the bug is emitting waves, the frequency of the waves reaching you is A higher B lower C the same

higher

Beats (in terms of sound) result from sound A refraction B reflection C interference D resonance

interference

The phenomenon of beats results from sound A interference B reflection C refraction D all of the above E none of the above

interference

When two or more waves are at the same place at the same time, the resulting effect is called A a standing wave B interference C a Doppler wave D a period E a shock wave

interference

If you are standing equally distant from two television sets that are emitting the exact same sound waves, the sound A is quieter because the waves destructively interfere B is louder because the waves destructively interfere C is quieter because the waves constructively interfere D is louder because the waves constructively interfere

is louder because the waves constructively interfere

A sonic boom A is swept continuously behind a plane flying faster than the speed of sound B is produced as a plane breaks through the sound barrier C is produced by subsonic projectiles as well as subsonic aircraft D all of the above E none of the above

is swept continuously behind a plane flying faster than the speed of sound

A transverse wave is created on a slinky. If the frequency becomes greater, what happens to the wavelength? A it becomes shorter B it becomes longer C it remains the same size

it becomes shorter

A red-shift in stars indicates that stars are moving away from us because A beats are observed B the stars vibrate at resonant frequencies C light emitted has a different frequency than expected due to the doppler effect D the speed of the light from the star is traveling faster E the star produces a shock wave that is a different color than expected.

light emitted has a different frequency than expected due to the doppler effect

A sound wave is a A standing wave B longitudinal wave C transverse wave D shock wave E none of the above

longitudinal wave

A wave in which the motion of the medium is parallel to the wave motion

longitudinal wave

Sound is an example of a A longitudinal wave B transverse wave C torsional wave

longitudinal wave

Suppose a bug is jiggling up and down and swimming away from you at the same time. Compared to the frequency at which the bug is emitting waves, the frequency of the waves reaching you is A lower B higher C there is no change in frequency

lower

When more holes are covered on a recorder, the frequency becomes A lower, because the wavelength is shorter B lower, because the wavelength is larger C higher, because the wavelength is longer D higher, because the wavelength is shorter.

lower, because the wavelength is larger

An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is A 0.1 s B 1 s C 10 s D 20 s E more than 20 s

more than 20s

Which of the following is not an example of the Doppler effect? A red-shift of stars B pendulum swinging C police radar D weather radar E nascar

pendulum swinging

The time needed for a wave to make one complete cycle is its A frequency B period C wavelength D velocity E amplitude

period

the time for one cycle

period

A change in frequency of sound results in a change in ______ by our brain

pitch

A person rubs her finger around the edge of a wine glass and the wine glass starts to "sing". This is an example of A beats B constructive interference C the Doppler effect D resonance

resonance

A singer shattering crystal glass with her voice is a demonstration of A beats B sound refraction C an echo D interference E resonance

resonance

Occurs when the frequency of forced vibrations matches natural frequency

resonance

Question The Tacoma Narrows Bridge collapsed due to A resonance B frequency modulation C beats D destructive interference

resonance

Occurs when the speed of a plane is greater than the speed of the sound wave

shock-wave

You dip your finger repeatedly into water and make waves. If you dip your finger more frequently, the wavelength of the waves A shortens B lengthens C stays the same

shortens

A sound wave that has a higher frequency has a wavelength that is A shorter B longer

shorter

Back and forth wave or vibratory motion

simple harmonic motion

Compared to the speed of light, sound travels A faster B slower C the same speed

slower

In which one of the following does sound travel the fastest A liquid B solid C gas D sound travels the same speed in all of the above

solid

Which of the following is NOT a transverse wave? A light B radio wave C sound D all of the above E none of the above

sound

Infrasonic sounds are A sounds that are too high to hear. B sounds that are too low to hear. C speeds that are faster than the speed of sound. D speeds that are slower than the speed of sound.

sounds that are too low to hear

An aircraft that flies slower than the speed of sound is said to be A subsonic B supersonic C neither of the above

subsonic

An aircraft that flies faster than the speed of sound is said to be A subsonic B supersonic C ultrasonic D infrasonic

supersonic

The speed of a sound wave depends on A the air temperature B its frequency C its wavelength D all of the above E none of the above

the air temperature

In a transverse wave, the wavelength is the distance from crest to crest. In a longitudinal wave, the wavelength is A the height of the wave B the distance from the start of a compression to the end of that compression C the distance from the start of a compression to the start of the next compression D the distance from the start of a compression to the start of a rarefaction

the distance from the start of a compression to the start of the next compression

The period of a pendulum depends on A the mass of the pendulum B the amplitude that it is pulled back C the length of the pendulum D all of the above

the length of the pendulum

The Doppler effect is the change in observed frequency due to A the type of medium the wave is in B the original frequency emitted by the source C the type of wave D the motion of the source or observer

the motion of the source or observer

A pendulum bob is pulled back 10 degrees and released when it has 50 g on it. The period is measured. A second trial is done with a 100 g bob. Ignoring the effects of air resistance, the 100 g bob will have A a longer period. B a shorter period. C the same period because period does not depend on mass.

the same period because period does not depend on mass

A wave created by shaking a rope up and down is called a A doppler wave B standing wave C longitudinal wave D constructive wave E transverse wave

transverse wave

A wave created by shaking a rope up and down is called a A longitudinal wave B transverse wave C resonance wave D constructive wave E Doppler wave

transverse wave

A wave in which the motion of the medium is perpendicular to the wave motion

transverse wave

A dog whistle utilizes A infrasonic sounds B subsonic sounds C supersonic sounds D ultrasonic sounds E none of the above

ultrasonic sounds

Sound waves cannot travel in A steel B air C vacuum D water E sound can travel in all of the above

vacuum

Sound waves are produced by A radio stations B vibrating objects C soft objects D objects under pressure E none of the above

vibrating objects

The source of all wave motion is A movement of matter B harmonic motion C vibration D region of variable high and low pressure

vibration

The distance between two successive points on a wave

wavelength