Question 1

The pitch of a sound is determined by the frequency; the higher the frequency, the higher the pitch.

Accepted Answer

A) True 
 B)False  True

Question 2

The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?

Accepted Answer

A) 400 Hz 
B) 600 Hz 
C) 1000 Hz 
D) 1400 Hz 
E) 1800 Hz 
A) 400 Hz 
B) 600 Hz 
C) 1000 Hz 
D) 1400 Hz 
E) 1800 Hz A

Question 3

Shock waves and a sonic boom occur when an object moves faster than the speed of sound.

Accepted Answer

A) True 
 B)False  True

Question 4

What determines the "pitch" of a musical note?

Accepted Answer

A) amplitude 
B) wavelength 
C) frequency 
D) phase 
E) intensity 
A) amplitude 
B) wavelength 
C) frequency 
D) phase 
E) intensity

Question 5

As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz. After the car goes by, you hear a frequency of 60.0 Hz. What is the speed of the car? Assume that he speed of sound in air is 343 m/s.

Accepted Answer

A) 64 m/s 
B) 49 m/s 
C) 16 m/s 
D) 36 m/s 
E) 25 m/s 
A) 64 m/s 
B) 49 m/s 
C) 16 m/s 
D) 36 m/s 
E) 25 m/s

Question 6

In a resonating pipe which is open at one end and closed at the other, there

Accepted Answer

A) are displacement nodes at each end. 
B) are displacement antinodes at each end. 
C) is a displacement node at the open end and a displacement antinode at the closed end. 
D) is a displacement node at the closed end and a displacement antinode at the open end. 
E) none of the above 
A) are displacement nodes at each end. 
B) are displacement antinodes at each end. 
C) is a displacement node at the open end and a displacement antinode at the closed end. 
D) is a displacement node at the closed end and a displacement antinode at the open end. 
E) none of the above

Question 7

In order to produce beats, the two sound waves should have

Accepted Answer

A) the same amplitude. 
B) slightly different amplitudes. 
C) the same frequency. 
D) slightly different frequencies. 
A) the same amplitude. 
B) slightly different amplitudes. 
C) the same frequency. 
D) slightly different frequencies.

Question 8

Sound travels as a transverse wave in air and other materials.

Accepted Answer

A) True 
 B)False

Question 9

Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers. What sound intensity does the other student measure?

Accepted Answer

A) 6.2 × 10-8 W/m2 
B) 1.5 × 10-7 W/m2 
C) 8.3 × 10-8 W/m2 
D) 7.8 × 10-7 W/m2 
E) 2.5 × 10-8 W/m2 
A) 6.2 × 10-8 W/m2 
B) 1.5 × 10-7 W/m2 
C) 8.3 × 10-8 W/m2 
D) 7.8 × 10-7 W/m2 
E) 2.5 × 10-8 W/m2

Question 10

Two strings of identical material and radius are stretched with the same tension with their ends fixed, but one string is 8.0 mm longer than the other. Waves on these strings propagate at 420 m/s. The fundamental frequency of the longer string is 528 Hz. What is the beat frequency when each string is vibrating at its fundamental frequency?

Accepted Answer

A) 22 Hz 
B) 11 Hz 
C) 16 Hz 
D) 5.5 Hz 
E) 27 Hz 
A) 22 Hz 
B) 11 Hz 
C) 16 Hz 
D) 5.5 Hz 
E) 27 Hz

Question 11

The lowest tone to resonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?

Accepted Answer

A) 400 Hz 
B) 600 Hz 
C) 800 Hz 
D) 900 Hz 
E) 1000 Hz 
A) 400 Hz 
B) 600 Hz 
C) 800 Hz 
D) 900 Hz 
E) 1000 Hz

Question 12

The wavelengths corresponding to the harmonics of an organ pipe that is open at one end and closed at the other can be found by saying that the length of the pipe must be equal to

Accepted Answer

A) an odd number of quarter-wavelengths. 
B) an odd number of third-wavelengths. 
C) an odd number of half-wavelengths. 
D) an integer number of half-wavelengths. 
E) an integer number of wavelengths. 
A) an odd number of quarter-wavelengths. 
B) an odd number of third-wavelengths. 
C) an odd number of half-wavelengths. 
D) an integer number of half-wavelengths. 
E) an integer number of wavelengths.

Question 13

You are driving along a highway at 25 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2300 Hz, but when it is past you the frequency becomes 1600 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s.

Accepted Answer

A) 37 m/s 
B) 32 m/s 
C) 30 m/s 
D) 41 m/s 
E) 50 m/s 
A) 37 m/s 
B) 32 m/s 
C) 30 m/s 
D) 41 m/s 
E) 50 m/s

Question 14

The sound level of a person talking at 1.0 m of distance is 60 dB. You are surrounded by five people all talking at the same time. What sound level are you being exposed to?

Accepted Answer

A) 600 dB 
B) 60 dB 
C) 74 dB 
D) 67 dB 
E) 81 dB 
A) 600 dB 
B) 60 dB 
C) 74 dB 
D) 67 dB 
E) 81 dB

Question 15

A 0.640-m long gas column is open at one end and closed at the other. What is the fundamental resonant frequency of the air column if the speed of sound in the air is 340 m/s?

Accepted Answer

A) 432 Hz 
B) 198 Hz 
C) 266 Hz 
D) 669 Hz 
E) 133 Hz 
A) 432 Hz 
B) 198 Hz 
C) 266 Hz 
D) 669 Hz 
E) 133 Hz

Question 16

An air column is being designed so that its second lowest resonant frequency is 440 Hz. The column is open at one end and closed at the other. What length should the column be if the speed of sound in air is 340 m/s?

Accepted Answer

A) 0.386 m 
B) 0.772 m 
C) 1.16 m 
D) 0.193 m 
E) 0.580 m 
A) 0.386 m 
B) 0.772 m 
C) 1.16 m 
D) 0.193 m 
E) 0.580 m

Question 17

If the intensity level of one trombone is 70 dB, what is the intensity level of 76 trombones?

Accepted Answer

A) 146 dB 
B) 89 dB 
C) 70 dB 
D) 76 dB 
E) 82 dB 
A) 146 dB 
B) 89 dB 
C) 70 dB 
D) 76 dB 
E) 82 dB

Question 18

Consider a closed pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?

Accepted Answer

A) 4L, 2L, L 
B) 2L, L, L/2 
C) 2L, L, 2L/3 
D) 3L, L, L/3 
E) 4L, 4L/3, 4L/5 
A) 4L, 2L, L 
B) 2L, L, L/2 
C) 2L, L, 2L/3 
D) 3L, L, L/3 
E) 4L, 4L/3, 4L/5

Question 19

Two in-phase loudspeakers are placed 6.00 m apart along one wall of a room. They emit sound with a frequency of 512Hz. Starting at the location of one of the loudspeakers, a microphone is moved in a direction perpendicular to the wall until constructive interference is detected for the first time. How far is the microphone from the wall at that point? The speed of sound in air is 330 m/s.

Accepted Answer

A) 0.141 m 
B) 0.664 m 
C) 0.203 m 
D) 0.138 m 
E) 0.282 m 
A) 0.141 m 
B) 0.664 m 
C) 0.203 m 
D) 0.138 m 
E) 0.282 m

Question 20

In a resonating pipe which is open at both ends, there

Accepted Answer

A) are displacement nodes at each end. 
B) are displacement antinodes at each end. 
C) is a displacement node at one end and a displacement antinode at the other end. 
D) all of the above are possible 
E) none of the above 
A) are displacement nodes at each end. 
B) are displacement antinodes at each end. 
C) is a displacement node at one end and a displacement antinode at the other end. 
D) all of the above are possible 
E) none of the above

Exam 16: Sound

The pitch of a sound is determined by the frequency; the higher the frequency, the higher the pitch.

The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe?

Shock waves and a sonic boom occur when an object moves faster than the speed of sound.

What determines the "pitch" of a musical note?

As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 80.0 Hz. After the car goes by, you hear a frequency of 60.0 Hz. What is the speed of the car? Assume that he speed of sound in air is 343 m/s.

In a resonating pipe which is open at one end and closed at the other, there

In order to produce beats, the two sound waves should have

Sound travels as a transverse wave in air and other materials.

Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10-7 W/m2. Another student is 4.0 m away from the talkers. What sound intensity does the other student measure?

The lowest tone to resonate in an open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pipe?

The wavelengths corresponding to the harmonics of an organ pipe that is open at one end and closed at the other can be found by saying that the length of the pipe must be equal to

The sound level of a person talking at 1.0 m of distance is 60 dB. You are surrounded by five people all talking at the same time. What sound level are you being exposed to?

A 0.640-m long gas column is open at one end and closed at the other. What is the fundamental resonant frequency of the air column if the speed of sound in the air is 340 m/s?

An air column is being designed so that its second lowest resonant frequency is 440 Hz. The column is open at one end and closed at the other. What length should the column be if the speed of sound in air is 340 m/s?

If the intensity level of one trombone is 70 dB, what is the intensity level of 76 trombones?

Consider a closed pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?

In a resonating pipe which is open at both ends, there

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Two people are talking at a distance of 3.0 m from where you are and you measure the sound intensity as 1.1 × 10^-7 W/m². Another student is 4.0 m away from the talkers. What sound intensity does the other student measure?