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There are 51 questions tagged under Sound.

1

### Q:

There are two bordering media with equal resistance to compression but different densities. A sound is then transmitted through the two media. Which of the following statements is true about this scenario?

### A

The sound will travel faster through the medium of higher density.

### B

The sound will travel faster through the medium of lower density.

### C

The sound will travel at the same speed through the media.

### D

The sound will travel faster through the medium of greater mass.

Tags: Sound |

2

### Q:

Which occurrence is possible with light waves but impossible with sound waves?

Interference

Doppler effect

Refraction

Polarization

Tags: Sound |

3

### Q:

Ancient civilizations in southeast Asia devised an intelligent method for long distance communication. Very long and thin brick roads were placed across a very large distance. Someone at one end could pound on the brick and the sound would travel relatively quickly and acutely to the person at the other end. Such technology was designed to warn of invaders and other issues. A leader of a small nation wants to build such a communication network. Workers report various types of stone: Stone A, when hit, is noted to have a very high pitch. Stone B, when hit, is noted to have a lower pitch. Stone C is a little harder than stones A and B. Stones A and B have relatively the same hardness. If the stones were arranged in a way to show how fast sound would travel through the stone, how would they be arranged?

C < A = B

A < B

A = B = C

A = B < C

Tags: Sound |

4

### Q:

Which of the following would functionally increase the velocity of a transverse wave traveling through a solid medium?

### A

Increasing the period of the wave

### B

Decreasing the frequency of the wave

### C

Increasing wavelength of the wave

### D

Decreasing wavelength of the wave

Tags: Sound |

5

### Q:

Which of the following would increase the speed of a sound wave traveling through a medium?

### A

Increase the density of the medium

### B

Decrease the rigidity of the medium

### C

Increase the rigidity of the medium

### D

Decrease the wavelength of the sound wave (while maintaining the same frequency)

Tags: Sound |

6

### Q:

Objects A and B move apart from one another. Each object is moving at 10 m/s in the direction opposite to the motion of the other object. Object A of the objects emits a tone of 1000 Hz. What is the frequency of the tone when heard by object B? Assume the speed of sound is 350 m/s.

### A

Greater than 1100 Hz

### B

Between 1000 and 1100 Hz

### C

Between 900 and 1000 Hz

Less than 900 Hz

Tags: Sound |

7

### Q:

A boat horn sounds at 120 Hz. A baritone player plays the same note and hears 2 beats. What frequency is the baritone player's note?

60 Hz or 240 Hz

118 Hz or 122 Hz

30 Hz or 480 Hz

116 Hz or 124 Hz

Tags: Sound |

8

### Q:

An upright wave is traveling along a thin rope. Upon merging onto a thicker portion of the same rope, which of the following would happen?

### A

The wave is reflected upright on the thin portion of the rope.

### B

The wave is transmitted upside-down on the thicker portion of the rope.

### C

The wave is both reflected (on the thin portion) and transmitted (on the thicker portion) upright on the rope.

### D

The wave is reflected (on the thin portion) upside-down and transmitted upright (on the thicker portion) on the rope.

Tags: Sound |

9

### Q:

An increase in sound intensity by a factor of 1000 corresponds to what increase in decibels?

10 dB

30 dB

50 dB

### D

100 dB

Tags: Sound | Quantitative Skills |

10

### Q:

Object A chases Object B as in the diagram above. Object A emits a sound with a frequency of 1000 Hz. What is the frequency of sound heard by Object B if the velocity of sound is 350 m/s?

880 Hz

940 Hz

1060 Hz

### D

1120 Hz

Tags: Kinematics | Sound | Quantitative Skills |

11

### Q:

A sound is emitted at point A in space, and radiates as a sphere in all directions outward. The total energy emitted by the sound at point A is 100 W. What is the total energy of the entire sound wave at a distance d from point A? Assume no friction.

100/d W

100/d2 W

100d2 W

### D

100 W

Tags: Energy & Work | Sound | Quantitative Skills |

12

### Q:

The frequency of a sonar pulse is given to be 4 Hz. The efficiency of a wave at a distance D can be described as E = T2/4Dkπ, where E is efficiency, T is period, and k is a scaling constant. For the sonar pulse, the efficiency is found to be X. What is the efficiency if frequency is increased to 8 Hz?

X/4

2X

3X

### D

4X

Tags: Sound | Quantitative Skills |

13

### Q:

A speaker travels around a 5m circle at a constant tangential velocity with a listener in the middle of the circle. The speaker emits a tune of of f. As the speaker moves around the listener, the listener will hear:

### A

a constant frequency below f.

### B

a constant frequency of f.

### C

a constant frequency above f.

### D

an oscillating frequency whose period is proportional to 2πf

Tags: Sound |

14

### Q:

Two cars, A and B, are moving toward one another but decelerating. During the deceleration, car A sounds its horn at a frequency of 400 Hz. Which of the following is most likely the frequency heard by car B?

325 Hz

375 Hz

400 Hz

### D

450 Hz

Tags: Sound | Quantitative Skills |

15

### Q:

At a rock concert, the band controls music using a knob with integers 1 through 10 on it. Each increasing integer doubles the sound intensity. When the knob points to 4, the sound is 45 decibels. Which of the following is closest to the decibel level if the knob is increased to 9?

52

60

80

### D

125

Tags: Sound | Quantitative Skills |

16

### Q:

A sound wave travels from a dense medium to a less dense medium. Which of the following will hold true after the wave enters the less dense medium?

### A

The wave will reflect in an inverted fashion

### B

Frequency of the wave will increase

### C

The wave will refract into the less dense medium in an inverted fashion

### D

None of the above

Tags: Sound |

17

### Q:

Where the interaction of two tones at 400 Hz and 405 Hz produces a beat frequency, that beat frequency is observed as a result of which of the following phenomena?

Doppler effect

### B

constructive and destructive interference of the sound

### C

shifting of one of the tone phases to match the other

### D

polarization of the sound

Tags: Sound |

18

### Q:

A car honks its horn at 600 Hz and is heard by a receiver at a frequency of 589 Hz. Which of the following explains the difference in frequencies heard?

### A

The car is moving toward the receiver and the receiver is stationary

### B

The receiver is moving toward the car and the car is stationary

### C

The receiver is moving away from the car and the car is stationary

### D

The car horn is fluctuating and 589 Hz is not a significant difference

Tags: Sound |

19

### Q:

A stationary object is emitting a tone of 1000 Hz while a car approaches it. If the car is also emitting a tone of 1000 Hz, and an observer on the stationary object hears a beat frequency of 10 Hz, how fast is the car moving toward the object? Assume the speed of sound in air is 350 m/s.

0.35 m/s

1.15 m/s

3.5 m/s

### D

10 m/s

Tags: Sound | Quantitative Skills |

20

### Q:

Ultrasonic distance detectors emit an ultrasonic frequency that bounces off of the opposing object and is picked up by the detector. The longer it takes for the sound to come back, the farther away it is. If the time between the sound emission and detection is 30 milliseconds, how far away is the object being measured? Note: assume the speed of sound is 350 m/s.

5 m

10 m

50 m

### D

100 m

Tags: Kinematics | Sound | Quantitative Skills |

21

### Q:

As a receiver moves away from a source of sound, the energy of the sound wave at a given distance decreases in proportion to which of the following?

### A

the surface area of a sphere

### B

the volume of a sphere

### C

the circumference of a circle

### D

the the surface area of a cube

Tags: Sound |

22

### Q:

A person is playing a piano, with a frequency of 200 Hz, directly next to another person playing the drums with a frequency of 175 Hz. What is the beat frequency of the two?

15 Hz

25 Hz

50 Hz

### D

75 Hz

Tags: Sound | Quantitative Skills |

23

### Q:

How many times more intense (W/m2) is 60 decibels than 40 decibels?

1.5

20

100

### D

1020

Tags: Sound | Quantitative Skills |

24

### Q:

On a cold and frosty night, a jet plane is speeding towards you (stationary) at 162.5 m/sec and sounds its horn at 150 Hz. The outside temperature is -10 degrees Celsius. At what approximate frequency do you hear the horn? The speed of sound at -10 degrees Celsius is 325 m/sec.

75 Hz

225 Hz

1500 Hz

### D

300 Hz

Tags: Sound | Quantitative Skills |

25

### Q:

How much greater is the beat frequency for a pair of tones at 12000 Hz and 12001 Hz versus a pair of tones at 4000 Hz and 4001 Hz?

### A

The beat frequency is 3 times greater.

### B

The beat frequency is 33% greater.

### C

The beat frequency is 2 times greater.

### D

The beat frequencies are the same for the two pairs of tones.

Tags: Sound | Quantitative Skills |

26

### Q:

Which of the following occurs with light but not with sound?

Doppler effect

Diffraction

Refraction

### D

Travel through vacuum

Tags: Sound | Electromagnetics |

27

### Q:

What beat frequency would be heard between two tones played simultaneously at 20 Hz and 25 Hz?

5 Hz

45 Hz

0.20 Hz

### D

0.25 Hz

Tags: Sound | Quantitative Skills |

28

### Q:

An observer hears a sound from a distance of d and moves to a distance of 2d from the source. At the distance of 2d, how does the amount of energy per unit area from the sound change as compared with the amount of energy from the sound at d?

2x

x/2

x/4

### D

x/8

Tags: Sound | Quantitative Skills |

29

### Q:

A string 25 cm long is fixed at both ends on an instrument. If the speed of sound is 350 m/s, what is the fundamental frequency of the sound?

14 Hz

700 Hz

7000 Hz

### D

8750 Hz

Tags: Sound | Quantitative Skills |

30

### Q:

Over a park, a plane flies by overhead at a speed faster than the speed of sound. Once the plane has passed by, which answer choice best describes what will be heard by someone sitting in the park?

No sonic boom

### B

Multiple sonic booms

### C

No sound at first, then one sonic boom, then the sound of the engines

### D

No sound at first, then the sound of the engines, then one sonic boom

Tags: Sound |

31

### Q:

The pitch of a sound wave depends on:

Frequency

Wavelength

Amplitude

### D

Speed

Tags: Sound | Miscellaneous Physics |

32

### Q:

Which of the following is true regarding an ambulance approaching a pedestrian sitting near a street?

### A

The frequency heard by the pedestrian is lower than the frequency of the approaching siren.

### B

The frequency heard by the pedestrian is higher than the frequency of the approaching siren.

### C

The distance between the wave crests emitted by the siren is higher in front of the ambulance than behind the ambulance.

### D

The pedestrian will not notice a change in pitch after the ambulance has passed.

Tags: Sound |

33

### Q:

The perception of pitch is the detection of which parameter of sound?

Frequency

Amplitude

Velocity

### D

Polarization

Tags: Sound | Sensory Processing |

34

### Q:

A loud noise is emitted from a point source. If the observer doubles their distance from the source, how much less sound energy reaches the observer?

1/2

1/4

1/3

1/6

Tags: Sound |

35

### Q:

The intensity of a sound production device is increased from 20 W/m2 to 20,000 W/m2. The decibel increase is equivalent to:

30 dB.

40 dB.

1000 dB.

19,980 dB.

Tags: Sound |

36

### Q:

A speaker creates sound of a frequency 500 Hz. This speaker is placed on a car which drives 340 m/s away from an observer. What is the frequency that the observer will hear?

0 Hz

160 Hz

500 Hz

250 Hz

Tags: Sound |

37

### Q:

Which of the following parameters of sound waves depends solely on the wave source, rather than the medium through which the wave travels?
I. period
II. wavelength
III. velocity

I only

II only

I and III only

I and II only

Tags: Sound |

38

### Q:

A wave has a speed of 10 m/s and a wavelength of 20 cm. Which of the following is its period?

0.02 seconds

0.2 seconds

2 seconds

20 seconds

Tags: Sound |

39

### Q:

A sound wave has a frequency 440 Hz with a wavelength X. If the sound is emitted from a sound source towards a wall, what is the number of waves that will hit the wall in one second?

220

440

440/X

440 * X

Tags: Sound |

40

### Q:

A sound wave with a velocity 4 cm/s and a wavelength 10 m has a period of:

2.5 seconds.

25 seconds.

250 seconds.

2500 seconds.

Tags: Sound |

41

### Q:

Instrument A is played with a frequency of 233 Hz while instrument B is played at a frequency of 228 Hz. Which of the following is the beat frequency that would occur?

2.5 Hz

5 Hz

230.5 Hz

0 Hz

Tags: Sound |

42

### Q:

A wave with a wavelength of 10 m and a frequency of 3 x 104 Hz travels across a long field. How long will it take for this wave to pass over 1 km?

0.001 seconds

0.003 seconds

0.09 seconds

0.3 seconds

Tags: Sound |

43

### Q:

Which of the following is the approximate wavelength of a 30 Hz wave with a velocity of 50 m/s?

0.6 m

1.5 m

1.7 m

1500 m

Tags: Sound |

44

### Q:

A whistle of frequency 750 Hz is blown on an truck moving east at 20 m/s. What approximate frequency sound would a stationary person standing west of the truck hear?

650 Hz

700 Hz

750 Hz

800 Hz

Tags: Sound |

45

### Q:

Two sound waves vibrate such that a listener hears a beat frequency of 4 Hz. Which of the following is a possible frequency of the two waves?

### A

448 Hz and 450 Hz

### B

400 Hz and 800 Hz

### C

400 Hz and 416 Hz

### D

448 Hz and 452 Hz

Tags: Sound |

46

### Q:

Various experiments are held evaluating listener's perceptions of the pitch of various sounds and emotional attachments to the pitches played to listeners. To perform such an experiment, a sound device would be needed that would be able to vary:

volume.

frequency.

wavelength.

noise.

Tags: Sound |

47

### Q:

The 'wave product' of a given wave is defined as the product of the square of wavelength and the cube of frequency. What is the wave product for a wave of wavelength 10 m and a frequency of 0.001/millisecond?

0.01 m2/s3

1 m2/s3

10 m2/s3

100 m2/s3

Tags: Sound |

48

### Q:

A particular individual has a hearing threshold of 25 dB. How many fold louder must a 5dB sound be increased in intensity for the individual to hear the sound?

20-fold

50-fold

100-fold

400-fold

Tags: Sound |

49

### Q:

Which of the following correctly lists the speed of sound through the following different states of matter?

### A

gas > liquid > solid

### B

gas > solid > liquid

### C

solid > liquid > gas

### D

solid > gas > liquid

Tags: Sound |

50

### Q:

Two sound waves of 20 hz and 25 hz are played simultaneously. Which of the following would be the beat frequency?

-5 hz

5 hz

25 hz

45 hz

Tags: Sound |

51

### Q:

Sound loss as it travels through a medium is referred to as:

harmonic loss.

resonance.

attenuation.

### D

the doppler effect.

Tags: Sound |

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