Final Practice 2

A piano tuner knows that a key on the piano is tuned to the frequency of his tuning fork when he strikes them at the same time and the number of beats he hears each second is A) 0. B) 1. C) 2. D) 3. E) 4.

A) 0. Practice test 19-21 Test 19-21

If the frequency of a certain wave is 10 hertz, its period is A) 0.1 second. B) 10 seconds. C) 100 seconds. D) None of the above choices are correct.

A) 0.1 second. Test 19-21

An object that completes 10 vibrations in 20 seconds has a frequency of A) 0.5 hertz. B) 2 hertz. C) 200 hertz.

A) 0.5 hertz. Test 19-21

A floating leaf oscillates up and down two complete cycles in one second as a water wave passes by. What is the wave's frequency? A) 2 hertz B) 6 hertz C) 1 hertz D) 3 hertz E) .5 hertz

A) 2hertz Test 19-21

A cello string .75 m long has a fundamental frequency of 220 hertz. The speed of the wave on the string is A) 330 m/s B) 165 m/s C) 294 m/s D) 220 m/s E) none of these

A) 330 m/s Practice test 19-21

About how many octaves are present between 100 hertz and 1600 hertz? A) 4 B) 5 C) 6 D) 7 E) 8

A) 4 Practice test 19-21

The beat frequency produced when a 240 hertz tuning fork and a 246 hertz tuning fork are sounded together is A) 6 hertz. B) 12 hertz. C) 240 hertz. D) 245 hertz. E) None of the above choices are correct.

A) 6 hertz. Test 19-21

If a guitar has no sounding board, a note played on the guitar will sound for A) A shorter time B) the same length of time C) a longer time

A) A shorter time Practice test 19-21

Sound waves can interfere with one another so that no sound results. A) True B) False C) Either true or false, depending on the air temperature.

A) True Test 19-21

The vibrations of a longitudinal wave move in a direction A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.

A) along the direction of wave travel. Test 19-21

Like a transverse wave, a longitudinal wave has A) amplitude, frequency, wavelength, and speed. B) amplitude, frequency, and wavelength. C) amplitude, wavelength, and speed. D) wavelength, speed, and frequency. E) amplitude, frequency, and speed.

A) amplitude, frequency, wavelength, and speed. Test 19-21

As we become older, the frequency range of human hearing A) decreases B) increases C) remains relatively the same

A) decreases Test 19-21

For FM radio, the F stands for A) frequency. B) forced vibration at which resonance occurs. C) foul. D) female. E) fax.

A) frequency. Practice test 19-21

The stride of a horse depends somewhat on the pendulum-like swing of its legs. This stride would be higher in frequency if more of the mass in its legs were concentrated A) in the upper part, nearer the horse's body. B) towards its feet. C) halfway up its legs. D) uniformly all along its legs. E) none of these.

A) in the upper part, nearer the horse's body Practice test 19-21

The energy of sound in air eventually becomes A) increased internal energy of the air. B) weaker and weaker until it disappears. C) cancelled by destructive interference. D) cancelled by both destructive and constructive interference

A) increased internal energy of the air. Practice test 19-21

Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the frequency of the pendulum A) increases. B) decreases. C) doesn't change.

A) increases. Practice test 19-21

If the waves are going by the same frequency, the wave that has the greatest speed will have the greatest A) length B) frequency C) amplitude D) None of the above

A) length Test 19-21*

The wavelengths of sound that carry farther in air are relatively A) long. B) short. C) ultrasonic.

A) long. Test 19-21

A sound wave is a A) longitudinal wave. B) transverse wave. C) standing wave. D) shock wave.

A) longitudinal wave. Homework 20 Practice Test 19-21

Compressions and rarefactions are characteristic of A) longitudinal waves. B) transverse waves. C) both longitudinal and transverse waves. D) none of the above.

A) longitudinal waves. Test 19-21

The frequencies of sound that carry farther in air are A) low. B) high. C) ultrasonic.

A) low. Practice test 19-21

A node is a position of A) minimum amplitude. B) maximum amplitude. C) half amplitude.

A) minimum amplitude. Practice test 19-21

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.

A) shortens. Test 19-21

The pendulum with the greatest frequency is the pendulum with the A) shortest period. B) shortest length. C) shortest amplitude. D) greatest amplitude

A) shortest period. Practice test 19-21

The natural frequency of an object depends on its A) size, shape and elasticity. B) size and shape. C) size and elasticity. D) shape and elasticity.

A) size, shape and elasticity. Practice test 19-21

The object with the highest natural frequency is a A) small bell. B) Taco bell. C) large bell.

A) small bell. Homework 20 Test 19-21

Which of the following is not a transverse wave? A) sound B) light C) radio

A) sound Homework 19

Which of the following is not a transverse wave? A) sound B) light C) radio D) all of these E) none of these

A) sound Test 19-21

In a longitudinal wave the compressions and rarefactions travel in A) the same direction. B) at right angles

A) the same direction. Homework 19 Practice Test 19-21

A Doppler effect occurs when a source of sound moves A) towards you. B) in a circle around you.

A) towards you. Homework 19 Practice Test 19-21

When the speed of sound near the ground is greater than it is at higher altitudes, the sound tends to be bent A) upward. B) downward. C) to the left. D) to the right. E) None of the above choices are correct.

A) upward. Practice test 19-21

The source of every sound is something that is A) vibrating. B) moving. C) accelerating. D) undergoing simple harmonic motion. E) a net emitter of energy.

A) vibrating. Test 19-21

A wiggle in time is a A) vibration. B) wave. C) both D) neither

A) vibration. Practice test 19-21

Sound travels faster in air if the air temperature is A) warm. B) cold. C) average.

A) warm. Practice test 19-21

Double the frequency of a sound and you halve its A) wavelength. B) speed. C) amplitude.

A) wavelength. Homework 20 Test 19-21

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

B) 1/60 hertz. Practice test 19-21

The approximate range of human hearing is A) 10 hertz to 10,000 hertz. B) 20 hertz to 20,000 hertz. C) 40 hertz to 40,000 hertz.

B) 20 hertz to 20,000 hertz. Homework 20 Test 19-21

A cello string .67 m long has a fundamental frequency of 220 hertz. The speed of the wave on the string is A) 330 m/s B) 295m/s C) 220 m/s D) 165 m/s E) none of these

B) 295m/s

A general rule for estimating the distance in kilometers between an observer and a lightning bolt is to count the number of seconds between seeing the lightning and hearing it, and dividing by A) 2. B) 3. C) 4. D) 5. E) none of these

B) 3. Practice test 19-21

Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is A) 0.3 m. B) 3.0 m. C) 30 m. D) 300 m. E) none of these

B) 3.0 m. Practice test 19-21 Test 19-21

A 60-vibration-per-second wave travels 30 meters in 1 second. Its frequency is A) 30 hertz and it travels at 60 m/s. B) 60 hertz and it travels at 30 m/s. C) 1800 hertz and it travels at 2 m/s.

B) 60 hertz and it travels at 30 m/s. Practice test 19-21

Xenon has atomic number 54, while Krypton has atomic number 36. Given that both gases are at the same temperature, in which medium does sound travel faster? A) Xenon gas B) Krypton gas C) a mixture of both gases D) the same in either gas

B) Krypton gas Practice test 19-21

A standing wave occurs when A) two waves overlap. B) a wave reflects upon itself. C) the speed of the wave is zero or near zero. D) the amplitude of a wave exceeds its wavelength.

B) a wave reflects upon itself. Homework 19 Test 19-21

A wave barrier is produced when a wave source moves A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces.

B) as fast as the waves it produces. Test 19-21

The least energy required to produce forced vibration in an object occurs A) below its natural frequency. B) at its natural frequency. C) above its natural frequency.

B) at its natural frequency. Practice test 19-21

The vibrations of a transverse wave move in a direction A) along the direction of wave travel. B) at right angles to the direction of wave travel. C) that changes with speed.

B) at right angles to the direction of wave travel. Practice test 19-21

For light, a red shift indicates that the light source is moving A) toward you. B) away from you. C) at right angles to you. D) actually, all of these E) none of these

B) away from you. Practice test 19-21

Repeatedly tap the side of a drinking glass with a spoon while filling it with water and you will notice that the pitch of the sound A) increases. B) decreases. C) remains relatively constant.

B) decreases. Practice test 19-21

Suppose a simple pendulum is suspended in an elevator. When the elevator is accelerating upward, the frequency of the pendulum A) increases. B) decreases. C) doesn't change.

B) decreases. Test 19-21

Inhaling helium increases the pitch of your voice. One reason for this is that sound travels A) slower in helium than in air. B) faster in helium than in air. C) the same speed in helium, but the wavelength is greater.

B) faster in helium than in air. Test 19-21

If you double the frequency of a vibrating object, its period A) doubles. B) halves. C) is quartered.

B) halves. Test 19-21

All other things being the same, strings having more mass than other strings will produce A) higher frequency notes. B) lower frequency notes. C) the same frequency notes.

B) lower frequency notes. Test 19-21

As a supersonic aircraft increases speed, the angle of its shock wave becomes A) wider. B) narrower.

B) narrower. Homework 19 Practice Test 19-21

During a single period, the distance traveled by a wave is A) one-half wavelength. B) one wavelength. C) two wavelengths.

B) one wavelength. Test 19-21

When you tune a radio to a certain station, you match the frequency of the internal electrical circuit to the frequency of the wanted radio station. In so doing you are employing the principle of A) forced vibrations. B) resonance. C) beats. D) reverberation. E) wave interference.

B) resonance. Practice test 19-21

A child swings to and fro on a playground swing. If the child stands rather than sits, the time for a to-and-fro swing is A) lengthened. B) shortened. C) unchanged.

B) shortened. Test 19-21

A base fiddle is louder than a harp because of its A) thicker strings. B) sounding board. C) lower pitch.

B) sounding board. Homework 20 Practice Test 19-21

On some days, air nearest the ground is colder than air that is higher up. On one of these days, sound waves A) tend to be refracted upward. B) tend to be refracted downward. C) travel without refraction.

B) tend to be refracted downward. Test 19-21

Sound will be louder if a struck tuning fork is held A) in the air. B) with its base against a table top. C) with its prongs in shallow water. D) in your closed fist.

B) with its base against a table top. Test 19-21

A floating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. The speed of the wave is A) 2 m/s. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of these

C) 10 m/s. Practice test 19-21

A string vibrating at is third harmonic frequency has a node at each end and, between these, A) No additional nodes B) 1 additional nodes C) 2 additional nodes D) 3 additional nodes E) 4 additional nodes

C) 2 additional nodes Test 19-21

An object that completes 14 vibrations in 7 seconds has a frequency of A) 0.5 hertz. B) 21 hertz. C) 2 hertz. D) 98 hertz.

C) 2 hertz. Homework 19

A fishing-boat captain returns to port saying, "It's rough out there - the waves are 4 meters high." He probably means that the amplitude of the waves is A) 4 m. B) 3 m. C) 2 m. D) 1 m.

C) 2 m. Test 19-21

The period of the second hand on a clock is A) 1 second. B) 1/60 second. C) 60 seconds. D) 3600 seconds.

C) 60 seconds. Homework 20 Test 19-21

The fundamental frequency of a violin string is 440 hertz. The frequency of its second harmonic is A) 220 hertz. B) 440 hertz. C) 880 hertz. D) None of the above choices are correct.

C) 880 hertz. Test 19-21

Sound waves cannot travel in A) water. B) steel. C) a vacuum.

C) a vacuum. Homework 20 Test 19-21

The speed of a sound wave in air depends on A) amplitude. B) wavelength. C) air temperature.

C) air temperature. Homework 20 Test 19-21

Some of a wave's energy dissipates as heat. In time, this will reduce the wave's A) speed. B) wavelength. C) amplitude. D) frequency. E) period.

C) amplitude. Practice test 19-21

For AM radio, the A stands for A) acceleration. B) authorized. C) amplitude. D) agony. E) almost.

C) amplitude. Test 19-21

A dolphin perceives its environment by the sense of A) sight. B) sound. C) both sight and sound. D) neither sight nor sound.

C) both sight and sound. Practice test 19-21

At a concert the oboe is playing a long steady note as you walk away from the stage at an accelerating velocity toward the rest room. The pitch of the sound that you hear is A) steady but higher than normal. B) steady but lower than normal. C) continually decreasing. D) continually increasing. E) None of the above choices are correct.

C) continually decreasing. Practice test 19-21

Which force binds atoms together to form molecules? A) gravitational B) nuclear C) electrical D) centripetal E) none of these

C) electrical Homework Chapter 22 Practice test 22-25

A bow wave is produced when a wave source moves A) slower than the waves it produces. B) at a right angle to the wave it prodices C) faster than the waves it produces.

C) faster than the waves it produces. Homework 19 Practice Test 19-21

The frequency of a simple pendulum is independent of its A) mass. B) length. C) gravity.

C) gravity Homework 19

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) All of the above choices are true. E) None of the above choices are true.

C) greater than the speed of sound. Test 19-21

The quality of a musical note has to do with its A) loudness. B) frequency. C) harmonics. D) amplitude. E) All of the above choices are correct.

C) harmonics. Practice test 19-21

In which one of these media does sound travel the fastest? A) water vapor B) water C) ice D) steam E) Sound travels the same speed in each of the above media

C) ice Practice test 19-21

The phenomenon of beats results from sound A) refraction. B) reflection. C) interference. D) all of these E) none of these

C) interference. Test 19-21

If at a concert, a wind blows directly from the orchestra toward you, the speed of the sound you hear will be A) decreased. B) increased. C) neither decreased nor increased.

C) neither decreased nor increased **** Test 19-21

A sound source of high frequency emits a high A) speed. B) amplitude. C) pitch.

C) pitch Homework 20 Test 19-21

A positive ion has more A) electrons than neutrons. B) electrons than protons. C) protons than electrons. D) neutrons than quarks.

C) protons than electrons. Homework Chapter 22 Practice Test 22-25

Which doesn't belong to the same family? A) infrasonic waves B) ultrasonic waves C) radio waves D) shock waves E) longitudinal waves

C) radio waves Practice test 19-21

Reverberation is a case of A) interference. B) forced vibrations. C) re-echoed sound. D) resonance.

C) re-echoed sound. Homework 20 Test 19-21

The explanation for refraction must involve a change in A) frequency. B) wavelength. C) speed. D) All of the above choices are true. E) None of the above choices are true.

C) speed. Test 19-21

Sound travels faster in A) air. B) water. C) steel.

C) steel. Homework 20 Practice Test 19-21

The frequency of a simple pendulum is dependents on A) mass. B) length. C) gravity. C) two of these E) None of these

C) two of these Practice test 19-21

A common source of wave motion is a A) wave pattern. B) harmonic object. C) vibrating object. D) region of variable high and low pressure.

C) vibrating object. Homework 19 Test 19-21

Compared to a sound of 30 decibels, a sound of 60 decibels is A) twice as intense. B) 10 times as intense. C) 100 times as intense. D) 1000 times as intense. E) 10,000 times as intense.

D) 1000 times as intense. Practice test 19-21

Two tuning forks produce sounds of wavelengths 3.4 meters and 3.3 meters. Approximately what beat frequency is produced? A) 0.1 hertz B) 1.0 hertz C) 2.0 hertz D) 3.0 hertz E) 4.0 hertz

D) 3.0 hertz Practice test 19-21

A floating leaf oscillates up and down four complete cycles in one second as a water wave passes by. The wave's wavelength is 10 meters. What is the wave's speed? A) 2 m/s B) 10 m/s C) 20 m/s D) 40 m/s

D) 40 m/s Test 19-21

In perceiving its environment, a dolphin makes use of A) echoes. B) the Doppler effect. C) ultrasound. D) All of the above choices are correct. E) None of the above choices are correct.

D) All of the above choices are correct. Test 19-21

Wave interference occurs for A) sound waves. B) light waves. C) water waves. D) All of the above choices are correct. E) None of the above choices are correct.

D) All of the above choices are correct. Test 19-21

We are best at hearing A) infrasonic sound. B) ultrasonic sound. C) both infrasonic and ultrasonic sounds. D) None of the above choices are true.

D) None of the above choices are true. Practice test 19-21

The Doppler effect is characteristic of A) water waves. B) sound waves. C) light waves. D) all of the above choices E) none of the above choices

D) all of the above choices Practice test 19-21

The loudness of a musical sound is a measure of the sound wave's A) wavelength. B) frequency. C) speed. D) amplitude. E) all of these

D) amplitude. Test 19-21

A decibel is a measure of a sound's A) frequency. B) wavelength. C) speed. D) loudness. E) all of these

D) loudness. Practice test 19-21

To say that one wave is out of phase with another is to say that the waves are A) of different amplitudes. B) of different frequencies. C) of different wavelengths. D) out of step. E) all of these

D) out of step. Practice test 19-21

Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of A) an echo. B) sound refraction. C) beats. D) resonance. E) interference.

D) resonance.

Suppose you sound a 1056-hertz tuning fork at the same time you strike a note on the piano and hear 2 beats/second. You tighten the piano string very slightly and now hear 3 beats/second. What is the frequency of the piano string? A) 1053 hertz B) 1054 hertz C) 1056 hertz D) 1058 hertz E) 1059 hertz

E) 1059 hertz Practice test 19-21

Double the frequency of sound and you also double its A) wavelength. B) speed. C) amplitude. D) all of these E) none of these

E) none of these Practice test 19-21