Question 1

A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz. What is the speed of sound in this gas?

Accepted Answer

A)  104 m/s 
B)  61.5 m/s 
C)  26.0 m/s 
D)  246 m/s 
E)  416 m/s 
A)  104 m/s 
B)  61.5 m/s 
C)  26.0 m/s 
D)  246 m/s 
E)  416 m/s

Question 2

You are driving along a highway at 35.0 m/s when you hear the siren of a police car approaching you from behind and you perceive the frequency as 1370 Hz. You are relieved that he is in pursuit of a different speeder when he continues past you, but now you perceive the frequency as 1330 Hz. What is the speed of the police car? The speed of sound in air is 343 m/s.

Accepted Answer

A)  38.4 m/s 
B)  30.0 m/s 
C)  39.2 m/s 
D)  40.0 m/s 
E)  41.7 m/s 
A)  38.4 m/s 
B)  30.0 m/s 
C)  39.2 m/s 
D)  40.0 m/s 
E)  41.7 m/s

Question 3

Which one of the following statements is true?

Accepted Answer

A)  Both the intensity level (in d
B)  and the sound intensity can never be negative. 
B)  The intensity level (in d
B)  obeys an inverse-square distance law, but the sound intensity does not. 
C)  Both intensity level (in d
B)  and sound intensity obey inverse-square distance laws. 
D)  The sound intensity can never be negative, but the intensity level (in d
B)  can be negative. 
E)  Both the intensity level (in d
B)  and the sound intensity can be negative. 
A)  Both the intensity level (in d
B)  and the sound intensity can never be negative. 
B)  The intensity level (in d
B)  obeys an inverse-square distance law, but the sound intensity does not. 
C)  Both intensity level (in d
B)  and sound intensity obey inverse-square distance laws. 
D)  The sound intensity can never be negative, but the intensity level (in d
B)  can be negative. 
E)  Both the intensity level (in d
B)  and the sound intensity can be negative.

Question 4

One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?

Accepted Answer

A)  32 Hz 
B)  64 Hz 
C)  88 Hz 
D)  128 Hz 
E)  256 Hz 
A)  32 Hz 
B)  64 Hz 
C)  88 Hz 
D)  128 Hz 
E)  256 Hz

Question 5

An airplane flying faster than the speed of sound of 340 m/s produces a shock wave that makes an angle of 50° with the direction the plane is flying. What is the speed of the plane?

Accepted Answer

A)  490 m/s 
B)  530 m/s 
C)  390 m/s 
D)  440 m/s 
E)  405 m/s 
A)  490 m/s 
B)  530 m/s 
C)  390 m/s 
D)  440 m/s 
E)  405 m/s

Question 6

A pipe that is 120 cm long resonates to produce sound of wavelengths 480 cm, 160 cm, and 96 cm but does not resonate at any wavelengths longer than these. This pipe is

Accepted Answer

A)  open at both ends. 
B)  open at one end and closed at the other end. 
C)  closed at both ends. 
D)  We cannot tell because we do not know the frequency of the sound. 
A)  open at both ends. 
B)  open at one end and closed at the other end. 
C)  closed at both ends. 
D)  We cannot tell because we do not know the frequency of the sound.

Exam 15: Sound and Hearing

A 1.30-m long gas column that is open at one end and closed at the other end has a fundamental resonant frequency 80.0 Hz. What is the speed of sound in this gas?

Which one of the following statements is true?

One of the harmonics of a column of air open at one end and closed at the other has a frequency of 448 Hz and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column?

An airplane flying faster than the speed of sound of 340 m/s produces a shock wave that makes an angle of 50° with the direction the plane is flying. What is the speed of the plane?

A pipe that is 120 cm long resonates to produce sound of wavelengths 480 cm, 160 cm, and 96 cm but does not resonate at any wavelengths longer than these. This pipe is

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