Question 1

The speed of a sound wave is determined by:

Accepted Answer

A) its amplitude 
B) its intensity 
C) its pitch 
D) number of overtones present 
E) the transmitting medium 
A) its amplitude 
B) its intensity 
C) its pitch 
D) number of overtones present 
E) the transmitting medium

Question 2

Two waves are out of phase by half a wavelength.What is this in degrees?

Accepted Answer

A) 45° 
B) 90° 
C) 135° 
D) 180° 
E) 360° 
A) 45° 
B) 90° 
C) 135° 
D) 180° 
E) 360°

Question 3

A fire whistle emits a tone of 170 Hz.Take the speed of sound in air to be 340 m/s.The wavelength of this sound is about:

Accepted Answer

A) 0.5 m 
B) 1.0 m 
C) 2.0 m 
D) 3.0 m 
E) 340 m 
A) 0.5 m 
B) 1.0 m 
C) 2.0 m 
D) 3.0 m 
E) 340 m

Question 4

Consider two imaginary spherical surfaces of different radius, both centered on a point sound source emitting spherical waves.The power transmitted across the larger sphere is ________ the power transmitted across the smaller and the intensity at a point on the larger sphere is ________ the intensity at a point on the smaller.

Accepted Answer

A) greater than, the same as 
B) greater than, greater than 
C) greater than, less than 
D) the same as, less than 
E) the same as, the same as 
A) greater than, the same as 
B) greater than, greater than 
C) greater than, less than 
D) the same as, less than 
E) the same as, the same as

Question 5

A stationary source S generates circular outgoing waves on a lake.The wave speed is 5.0 m/s and the crest-to-crest distance is 2.0 m.A person in a motor boat heads directly toward S at 3.0 m/s.To this person, the frequency of these waves is:

Accepted Answer

A) 1.0 Hz 
B) 1.5 Hz 
C) 2.0 Hz 
D) 4.0 Hz 
E) 8.0 Hz 
A) 1.0 Hz 
B) 1.5 Hz 
C) 2.0 Hz 
D) 4.0 Hz 
E) 8.0 Hz

Question 6

If the sound level is increased by 10 db the intensity increases by a factor of:

Accepted Answer

A) 2 
B) 5 
C) 10 
D) 20 
E) 100 
A) 2 
B) 5 
C) 10 
D) 20 
E) 100

Question 7

The standard reference sound level is about:

Accepted Answer

A) the threshold of human hearing at 1000 Hz 
B) the threshold of pain for human hearing at 1000 Hz 
C) the level of sound produced when the 1 kg standard mass is dropped 1 m onto a concrete floor 
D) the level of normal conversation 
E) the level of sound emitted by a standard 60 Hz tuning fork 
A) the threshold of human hearing at 1000 Hz 
B) the threshold of pain for human hearing at 1000 Hz 
C) the level of sound produced when the 1 kg standard mass is dropped 1 m onto a concrete floor 
D) the level of normal conversation 
E) the level of sound emitted by a standard 60 Hz tuning fork

Question 8

At points in a sound wave where the gas is maximally compressed, the pressure

Accepted Answer

A) is a maximum 
B) is a minimum 
C) is equal to the ambient value 
D) is greater than the ambient value but less than the maximum 
E) is less than the ambient value but greater than the minimum 
A) is a maximum 
B) is a minimum 
C) is equal to the ambient value 
D) is greater than the ambient value but less than the maximum 
E) is less than the ambient value but greater than the minimum

Question 9

A 200-cm organ pipe with one end open is in resonance with a sound wave of wavelength 270 cm.The pipe is operating in its:

Accepted Answer

A) fundamental frequency 
B) first harmonic 
C) second harmonic 
D) third harmonic 
E) fourth harmonic 
A) fundamental frequency 
B) first harmonic 
C) second harmonic 
D) third harmonic 
E) fourth harmonic

Question 10

Two identical tuning forks vibrate at 256 Hz.One of them is then loaded with a drop of wax, after which 6 beats per second are heard.The frequency of the loaded tuning fork is:

Accepted Answer

A) 250 Hz 
B) 253 Hz 
C) 256 Hz 
D) 259 Hz 
E) 262 Hz 
A) 250 Hz 
B) 253 Hz 
C) 256 Hz 
D) 259 Hz 
E) 262 Hz

Question 11

Five organ pipes are described below.Which one has the highest fundamental frequency?

Accepted Answer

A) A 2.3-m pipe with one end open and the other closed 
B) A 3.3-m pipe with one end open and the other closed 
C) A 1.6-m pipe with both ends open 
D) A 3.0-m pipe with both ends open 
E) a pipe in which the displacement nodes are 5 m apart 
A) A 2.3-m pipe with one end open and the other closed 
B) A 3.3-m pipe with one end open and the other closed 
C) A 1.6-m pipe with both ends open 
D) A 3.0-m pipe with both ends open 
E) a pipe in which the displacement nodes are 5 m apart

Question 12

This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the amplitude of the wave?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Exam 17: Waves

The speed of a sound wave is determined by:

Two waves are out of phase by half a wavelength.What is this in degrees?

A fire whistle emits a tone of 170 Hz.Take the speed of sound in air to be 340 m/s.The wavelength of this sound is about:

A stationary source S generates circular outgoing waves on a lake.The wave speed is 5.0 m/s and the crest-to-crest distance is 2.0 m.A person in a motor boat heads directly toward S at 3.0 m/s.To this person, the frequency of these waves is:

If the sound level is increased by 10 db the intensity increases by a factor of:

The standard reference sound level is about:

At points in a sound wave where the gas is maximally compressed, the pressure

A 200-cm organ pipe with one end open is in resonance with a sound wave of wavelength 270 cm.The pipe is operating in its:

Two identical tuning forks vibrate at 256 Hz.One of them is then loaded with a drop of wax, after which 6 beats per second are heard.The frequency of the loaded tuning fork is:

Five organ pipes are described below.Which one has the highest fundamental frequency?

This graph shows the position of an element of air as a function of time as a sound wave passes through it.Which letter corresponds to the amplitude of the wave?

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