Ch 19, 20 and 21 - Test 5

A Doppler effect occurs when a source of sound moves A) toward you. B) at right angles to you. C) both of these D) none of these

A

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) 10 m/s B) 15 m/s C) 5 m/s D) 2 m/s E) none of these

A

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

A

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

A skipper on a boat notices wave crests passing the anchor chain every 5 seconds. The skipper estimates the distance between crests is 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 given

A

A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) None of the above choices are correct.

A

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

A

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

A

As a supersonic craft increases in speed, the angle of its V-shaped wave becomes A) narrower B) wider C) neither

A

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

A

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

A

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

In a longitudinal wave the compression and rarefaction travel in A) the same direction. B) opposite directions. C) a vacuum.

A

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

Reverberation is a case of A) re-echoing of sound B) forced vibration C) resonance D) interference

A

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

The approximate range of human hearing is A) 20 - 20,000Hz B) 40 - 40,000Hz C) 10 - 10,000Hz

A

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

A

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

A

The sonic boom at ground level produced by an aircraft will be reduced if the aircraft A) is smaller, flies higher, and is more streamlined. B) flies higher. C) is more streamlined. D) is smaller. E) None of the above choices are true.

A

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

A

The stride of a horse depends somewhat on the pendulum like swing of its legs. The 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) uniformly all along its legs C) towards its feet D) halfway up its legs E) none of these

A

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

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

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

A

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

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

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

B

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

B

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

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

B

A pendulum clock at high altitudes runs A) fast. B) slow. C) normally as it does at sea level.

B

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

B

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 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

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

B

An aircraft that flies faster than the speed of sound is said to be A) subsonic. B) supersonic. C) impossible.

B

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

B

As a supersonic craft increases in speed, the angle of its V-shaped shock wave becomes A) wider. B) narrower. C) neither

B

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) continually increasing B) continually decreasing C) steady but lower than normal D) steady but higher than normal E) none of the above choices are correct

B

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

B

How many vibrations per second are associated with a 101-MHz radio wave? A) less than 101,000,000 B) 101,000,000 C) more than 101,000,000

B

If at a concert you run toward the orchestra, the frequency of the sound you hear will be A) decreased. B) increased. C) neither decreased nor increased.

B

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.

B

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

B

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

B

In a longitudinal wave the compressions and rarefactions travel A) at right angles to the wave B) in the same direction as the wave C) in opposite directions

B

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

Sound travels faster in A) air B) steel C) water D) a vacuum

B

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

B

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

B

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

B

The source of a sonic boom A) must itself be an emitter of sound. B) may or may not be an emitter of sound. C) is not itself an emitter of sound.

B

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

When a pendulum clock at sea level is taken to the top of a high mountain, it will A) gain time. B) lose time. C) neither gain nor lose time.

B

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

B

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

C

A Doppler effect occurs when a source of sound moves A) towards you. B) away from you. C) either towards you or away from you. D) in a circle around you.

C

A bow wave 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.

C

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. E) none of these

C

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

A floating leaf oscillates up and down two complete cycles each second as a water wave passes by. What is the wave's frequency? A) 0.5 hertz B) 1 hertz C) 2 hertz D) 3 hertz E) 6 hertz

C

A floating leaf oscillates up and down two 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 E) more than 40 m/s

C

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

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

C

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

C

An object that completes 20 vibrations in 10 seconds has a frequency of A) 0.5 hertz. B) 1 hertz. C) 2 hertz. D) 200 hertz.

C

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

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

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

Sound waves can not travel in A) water B) steel C) a vacuum

C

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 these

C

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

C

The period of the second hand on a clock is A) 1 second. B) 1/60 second. C) 60 seconds. D) 3600 seconds. E) 12 hours.

C

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

C

Two wave crests are generated at opposite ends of a long rope. Will there be an instant in which the rope's amplitude is zero everywhere? A) Yes, if the waves have the same amplitude B) Yes, if the waves have different amplitudes. C) No.

C

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

C

A common source of wave motion is A) a harmonic object B) a wave pattern C) a region of changing pressure D) a vibrating object

D

A jet traveling at 1500 km/hr passes between observers A and B. In a short time a sonic boom will be heard by A) observer A , observer B, and the pilot of the jet. B) observer A only. C) observer B only. D) observers A and B, but not the pilot.

D

A wave oscillates up and down two complete cycles each second. If the wave travels an average distance of 6 meters in one second, its wavelength is A) 0.5 m. B) 1 m. C) 2 m. D) 3 m. E) 6 m.

D

A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is A) less than 1 meter. B) 1 meter. C) more than 1 meter. D) not enough information to say

D

A wave travels an average distance of 6 meters in one second. What is the wave's velocity? A) less than 0.2 m/s B) 1 m/s C) 3 m/s D) 6 m/s E) more than 6 m/s

D

An object that completes 100 vibrations in 5 seconds has a period of A) 0.5 second. B) 1 second. C) 2 seconds. D) None of the above choices are correct.

D

An object that completes 14 vibrations in 7 seconds has a frequency of A) 98Hz B) .5Hz C) 21Hz D) 2Hz

D

As a train of water waves goes by, a piece of cork floating on the water bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave? A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s

D

If waves are going by at the same speed, the wave with the greatest period of oscillation is the wave that has the greatest A) amplitude. B) length. C) frequency. D) None of the above choices are true.

D

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

D

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

D

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

The Doppler effect occurs when a source of sound moves A) towards you B) in a circle around you C) away from you D) either towards you or away from you

D

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

D

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

D

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

D

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

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

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

D

As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of its A) loudness, frequency, and wavelength. B) loudness and wavelength. C) loudness and frequency. D) frequency and wavelength. E) None of the above choices are correct.

E

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

E

The frequency of a simple pendulum depends on A) length B) its mass C) the acceleration due to gravity D) all of these E) two of these

E

The frequency of a simple pendulum depends on A) its mass. B) its length. C) the acceleration due to gravity. D) all of these E) two of these

E