Question 1

In general,the speed of sound increases as the density of a medium ______________.

Accepted Answer

The answer of In general,the speed of sound increases as...

Question 2

The radiation given off by the nucleus of an atom is called

Accepted Answer

A)   a microwave.
B)   a gamma ray.
C)   an X-ray.
D)   any of these.

Question 3

An increase of 20 dB increases the sound intensity by a factor of

Accepted Answer

A)   10.
B)   200.
C)   100.
D)   20.

Question 4

What is the frequency,in hertz,of a sound wave (v = 340 m/s) with a wavelength of 68 m?

Accepted Answer

A)   5 Hz
B)   23120 Hz
C)   340 Hz
D)   0.2 Hz

Question 5

A series of ocean waves are moving past a surfer at a frequency of 40 waves per hour.Approximately how many waves would the surfer expect during 48 minutes?

Accepted Answer

A)   1920 waves
B)   32 waves
C)   40 waves
D)   50 waves

Question 6

For the Doppler effect to occur,there must be

Accepted Answer

A)   a moving source.
B)   a moving observer.
C)   relative motion between a source and an observer.
D)   no motion. C

Question 7

Which of the following electromagnetic radiations has the greatest frequency?

Accepted Answer

A)   Ultraviolet
B)   Infrared
C)   Radio
D)   Visible

Question 8

When an oscillator is driven in resonance,

Accepted Answer

A)   there are no standing waves.
B)   any driving frequency may be used.
C)   all natural frequencies are present.
D)   there is maximum energy transfer.

Question 9

Approximately how many times faster is the speed of light in vacuum than the speed of sound in air?

Accepted Answer

The answer of Approximately how many times faster is the...

Question 10

The loudness of a sound wave is determined by its ______________.

Accepted Answer

The answer of The loudness of a sound wave is...

Question 11

A Doppler red shift indicates

Accepted Answer

A)   a shift toward higher frequencies.
B)   a shift toward longer wavelengths.
C)   that a light source is approaching relative to the observer.
D)   none of these.

Question 12

All waves transfer ______________.

Accepted Answer

The answer of All waves transfer ______________....

Question 13

Electromagnetic waves are

Accepted Answer

A)   longitudinal.
B)   reverse.
C)   transverse.
D)   a combination of these.

Question 14

Which of the following radiations has the smallest wavelength?

Accepted Answer

A)   Infrared
B)   Visible
C)   Ultraviolet
D)   X-rays

Question 15

For a transverse mechanical wave,the particle motion is

Accepted Answer

A)   both parallel and perpendicular to the direction of the wave velocity.
B)   parallel to the direction of the wave velocity.
C)   perpendicular to the direction of the wave velocity.
D)   in all directions.

Question 16

A sound with a frequency of 25 kHz is in the ______________ region of the sound spectrum.

Accepted Answer

A)   infrasonic
B)   ultrasonic
C)   audible
D)   visible B

Question 17

Light waves travel fastest in

Accepted Answer

A)   water.
B)   glass.
C)   a vacuum.
D)   air.
E)   none of these; they travel at the same speed in all these media.

Question 18

Wave frequency could be given in

Accepted Answer

A)   1/s.
B)   s-1
C)   Hz.
D)   any of these.

Question 19

Wave period is the reciprocal of

Accepted Answer

A)   amplitude.
B)   frequency.
C)   wave velocity.
D)   all of these. B

Question 20

Wave amplitude is related to

Accepted Answer

A)   wave velocity.
B)   frequency.
C)   energy.
D)   wavelength.

Exam 6: Waves and Sound

In general,the speed of sound increases as the density of a medium ______________.

Correct AnswerverifiedShow Answer

The radiation given off by the nucleus of an atom is called

Correct AnswerverifiedShow Answer

An increase of 20 dB increases the sound intensity by a factor of

Correct AnswerverifiedShow Answer

What is the frequency,in hertz,of a sound wave (v = 340 m/s) with a wavelength of 68 m?

Correct AnswerverifiedShow Answer

A series of ocean waves are moving past a surfer at a frequency of 40 waves per hour.Approximately how many waves would the surfer expect during 48 minutes?

Correct AnswerverifiedShow Answer

For the Doppler effect to occur,there must be

Correct AnswerverifiedC

Which of the following electromagnetic radiations has the greatest frequency?

Correct AnswerverifiedShow Answer

When an oscillator is driven in resonance,

Correct AnswerverifiedShow Answer

Approximately how many times faster is the speed of light in vacuum than the speed of sound in air?

Correct AnswerverifiedShow Answer

The loudness of a sound wave is determined by its ______________.

Correct AnswerverifiedShow Answer

A Doppler red shift indicates

Correct AnswerverifiedShow Answer

All waves transfer ______________.

Correct AnswerverifiedShow Answer

Electromagnetic waves are

Correct AnswerverifiedShow Answer

Which of the following radiations has the smallest wavelength?

Correct AnswerverifiedShow Answer

For a transverse mechanical wave,the particle motion is

Correct AnswerverifiedShow Answer

A sound with a frequency of 25 kHz is in the ______________ region of the sound spectrum.

Correct AnswerverifiedB

Light waves travel fastest in

Correct AnswerverifiedShow Answer

Wave frequency could be given in

Correct AnswerverifiedShow Answer

Wave period is the reciprocal of

Correct AnswerverifiedB

Wave amplitude is related to

Correct AnswerverifiedShow Answer

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C

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B

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B

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