Question 1

What is the speed of sound in air at a temperature of -110 S1U1P1$\circ$S1S1P0F?

Accepted Answer

A) ​279 m/s 
B) ​407 m/s 
C) ​256 m/s 
D) ​3 470 m/s 
A) ​279 m/s 
B) ​407 m/s 
C) ​256 m/s 
D) ​3 470 m/s A

Question 2

Which of the following ranges corresponds to the longest wavelengths?

Accepted Answer

A) infrasonic 
B) audible 
C) ultrasonic 
D) all have the same wavelengths 
A) infrasonic 
B) audible 
C) ultrasonic 
D) all have the same wavelengths A

Question 3

You stand by the railroad tracks as a train passes by.You hear a 1 020-Hz frequency when the train approaches,which changes to 760 Hz as it goes away.How fast is the train moving? The speed of sound in air is 340 m/s.

Accepted Answer

A) 30.2 m/s 
B) 34.5 m/s 
C) 40.1 m/s 
D) 49.7 m/s 
E) 45.6 m/s 
A) 30.2 m/s 
B) 34.5 m/s 
C) 40.1 m/s 
D) 49.7 m/s 
E) 45.6 m/s D

Question 4

What phenomenon is created by two tuning forks,side by side,emitting frequencies,which differ by only a small amount?

Accepted Answer

A) resonance 
B) interference 
C) the Doppler effect 
D) beats 
A) resonance 
B) interference 
C) the Doppler effect 
D) beats

Question 5

If the air temperature decreases,how does the resonant frequency in a pipe closed at one end change?

Accepted Answer

A) It increases. 
B) It decreases. 
C) It doesn't change since one end of the pipe is closed. 
D) It doesn't change because resonance is pressure phenomenon. 
A) It increases. 
B) It decreases. 
C) It doesn't change since one end of the pipe is closed. 
D) It doesn't change because resonance is pressure phenomenon.

Question 6

Consider a vibrating string that makes a sound wave that moves through the air.As the guitar string moves up and down,the air molecules that are a certain horizontal distance from the string will move

Accepted Answer

A) up and down. 
B) toward and away from the guitar string. 
C) back and forth along the direction of the length of the string. 
D) in circles around the guitar string. 
A) up and down. 
B) toward and away from the guitar string. 
C) back and forth along the direction of the length of the string. 
D) in circles around the guitar string.

Question 7

When one note is above another note by an octave,the frequency of the higher pitch note is double that of the lower pitch note.The word octave may make you think that there are 8 steps from the lower note to the one an octave above.But wait! How many steps are there on a piano from middle C to the next C above? Each key is a step.If each next key is a step,how many are there? Middle C is a white (W)key and the next note above is a black (B)key.Starting at middle C on the piano the sequence of key we go through to get to high C,is BWBWWBWBWBWW,the last key being high C.Count 'em.That's 12 steps.If the multiplying factor of the frequency for the next step is the same for each step,what is that multiplying frequency? All you need is given in this problem statement.

Accepted Answer

A) 101/12 
B) 121/8 
C) 21/8 
D) 21/12 
A) 101/12 
B) 121/8 
C) 21/8 
D) 21/12

Question 8

When a sine wave is used to represent a sound wave,the crest corresponds to

Accepted Answer

A) rarefaction. 
B) condensation. 
C) point where molecules vibrate at a right angle to the direction of wave travel. 
D) region of low elasticity. 
A) rarefaction. 
B) condensation. 
C) point where molecules vibrate at a right angle to the direction of wave travel. 
D) region of low elasticity.

Question 9

A 2.5-m-long organ pipe is open at one end and closed at the other.Its fundamental tone has wavelength

Accepted Answer

A) 1.3 m. 
B) 5.0 m. 
C) 10 m. 
D) 16 m. 
E) 2.5 m. 
A) 1.3 m. 
B) 5.0 m. 
C) 10 m. 
D) 16 m. 
E) 2.5 m.

Question 10

A child sits on a swing supported by ropes of length 2.0 m.With what frequency will she need to apply the driving force to maintain swinging?

Accepted Answer

A) 0.35 Hz 
B) 0.70 Hz 
C) 1.7 Hz 
D) 2.8 Hz 
E) 5.4 Hz 
A) 0.35 Hz 
B) 0.70 Hz 
C) 1.7 Hz 
D) 2.8 Hz 
E) 5.4 Hz

Question 11

By what amount does the sound intensity decrease when the distance to the source doubles?

Accepted Answer

A) 1.4 dB 
B) 2 dB 
C) 4 dB 
D) 6.0 dB 
E) 0.25 dB 
A) 1.4 dB 
B) 2 dB 
C) 4 dB 
D) 6.0 dB 
E) 0.25 dB

Question 12

The density of a certain metal solid is 6.5 × 103 kg/m3,and its Young's modulus is 10.0 × 1010 N/m2.What is the speed of sound in this metal?

Accepted Answer

A) 8.1E+1 m/s 
B) 1.2E+3 m/s 
C) 3.9E+3 m/s 
D) 1.2E+5 m/s. 
E) 8.1E+1 m/s. 
A) 8.1E+1 m/s 
B) 1.2E+3 m/s 
C) 3.9E+3 m/s 
D) 1.2E+5 m/s. 
E) 8.1E+1 m/s.

Question 13

A 1.30-m string is held fixed at both ends.When driven by a 140-Hz source,the string vibrates in 4 distinct segments.What is the natural fundamental frequency of the string?

Accepted Answer

A) 35.0 Hz 
B) 70.0 Hz 
C) 215 Hz 
D) 431 Hz 
E) 45.5 Hz 
A) 35.0 Hz 
B) 70.0 Hz 
C) 215 Hz 
D) 431 Hz 
E) 45.5 Hz

Question 14

A 90-m-long high-voltage cable is suspended between two towers.The mass of the 90-m cable is 100 kg.If the tension in the cable is 25 000 N,what is the lowest frequency at which this cable can oscillate?

Accepted Answer

A) 0.83 Hz 
B) 1.00 Hz 
C) 1.7 Hz 
D) 2.00 Hz 
E) 3.3 Hz 
A) 0.83 Hz 
B) 1.00 Hz 
C) 1.7 Hz 
D) 2.00 Hz 
E) 3.3 Hz

Question 15

A sound wave coming from a tuba has a wavelength of 1.10 m and travels to your ears at a speed of 253 m/s.What is the frequency of the sound you hear?

Accepted Answer

A) 278 Hz 
B) 1/278 Hz 
C) 230 Hz 
D) 1/230 Hz 
E) ​252 Hz 
A) 278 Hz 
B) 1/278 Hz 
C) 230 Hz 
D) 1/230 Hz 
E) ​252 Hz

Question 16

Two tuning forks sounding together result in a beat frequency of 4.00 Hz.If the frequency of one of the forks is 258 Hz,what is the frequency of the other?

Accepted Answer

A) 266 Hz or 250 Hz 
B) 129 Hz 
C) 254 Hz or 262 Hz 
D) 64.5 Hz 
E) 131 Hz 
A) 266 Hz or 250 Hz 
B) 129 Hz 
C) 254 Hz or 262 Hz 
D) 64.5 Hz 
E) 131 Hz

Question 17

What sound level change corresponds to a factor of two change in intensity?

Accepted Answer

A) 0.2 dB 
B) 2.0 dB 
C) 3.0 dB 
D) 11 dB 
E) 20 dB 
A) 0.2 dB 
B) 2.0 dB 
C) 3.0 dB 
D) 11 dB 
E) 20 dB

Question 18

An iceberg breaks off from a glacier on the shore of the ocean with a loud cracking sound.the air.A person on a ship hears the sound in the water 4.0 s before hearing the sound in the air.How far away is the ship? The ambient temperature is -5.0S1U1P1$\circ$S1S1P0C.The speed of sound in saltwater is 1 530 m/s.

Accepted Answer

A) 5 700 m 
B) 1 700 m 
C) 1 100 m 
D) 380 m 
A) 5 700 m 
B) 1 700 m 
C) 1 100 m 
D) 380 m

Question 19

A sound source of frequency 1 100 Hz moves at 40.0 m/s toward a listener who is at rest.What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)

Accepted Answer

A) 1 230 Hz 
B) 970 Hz 
C) 980 Hz 
D) 1 250 Hz 
E) 870 Hz 
A) 1 230 Hz 
B) 970 Hz 
C) 980 Hz 
D) 1 250 Hz 
E) 870 Hz

Question 20

Two cars,one in front of the other,are traveling down the highway at 55.0 m/s.The car behind sounds its horn,which has a frequency of 530 Hz.What is the frequency heard by the driver of the lead car? (vsound = 340 m/s)

Accepted Answer

A) 382 Hz 
B) 735 Hz 
C) 456 Hz 
D) 530 Hz 
E) 632 Hz 
A) 382 Hz 
B) 735 Hz 
C) 456 Hz 
D) 530 Hz 
E) 632 Hz

Exam 14: Sound

What is the speed of sound in air at a temperature of -110 ∘\circ∘ F?

Which of the following ranges corresponds to the longest wavelengths?

You stand by the railroad tracks as a train passes by.You hear a 1 020-Hz frequency when the train approaches,which changes to 760 Hz as it goes away.How fast is the train moving? The speed of sound in air is 340 m/s.

What phenomenon is created by two tuning forks,side by side,emitting frequencies,which differ by only a small amount?

If the air temperature decreases,how does the resonant frequency in a pipe closed at one end change?

Consider a vibrating string that makes a sound wave that moves through the air.As the guitar string moves up and down,the air molecules that are a certain horizontal distance from the string will move

When a sine wave is used to represent a sound wave,the crest corresponds to

A 2.5-m-long organ pipe is open at one end and closed at the other.Its fundamental tone has wavelength

A child sits on a swing supported by ropes of length 2.0 m.With what frequency will she need to apply the driving force to maintain swinging?

By what amount does the sound intensity decrease when the distance to the source doubles?

The density of a certain metal solid is 6.5 × 103 kg/m3,and its Young's modulus is 10.0 × 1010 N/m2.What is the speed of sound in this metal?

A 1.30-m string is held fixed at both ends.When driven by a 140-Hz source,the string vibrates in 4 distinct segments.What is the natural fundamental frequency of the string?

A 90-m-long high-voltage cable is suspended between two towers.The mass of the 90-m cable is 100 kg.If the tension in the cable is 25 000 N,what is the lowest frequency at which this cable can oscillate?

A sound wave coming from a tuba has a wavelength of 1.10 m and travels to your ears at a speed of 253 m/s.What is the frequency of the sound you hear?

Two tuning forks sounding together result in a beat frequency of 4.00 Hz.If the frequency of one of the forks is 258 Hz,what is the frequency of the other?

What sound level change corresponds to a factor of two change in intensity?

A sound source of frequency 1 100 Hz moves at 40.0 m/s toward a listener who is at rest.What is the apparent frequency heard by the listener? (speed of sound = 340 m/s)

Two cars,one in front of the other,are traveling down the highway at 55.0 m/s.The car behind sounds its horn,which has a frequency of 530 Hz.What is the frequency heard by the driver of the lead car? (vsound = 340 m/s)

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Filters

What is the speed of sound in air at a temperature of -110 ^$\circ$F?

The density of a certain metal solid is 6.5 × 10³ kg/m³,and its Young's modulus is 10.0 × 10¹⁰ N/m².What is the speed of sound in this metal?

Two cars,one in front of the other,are traveling down the highway at 55.0 m/s.The car behind sounds its horn,which has a frequency of 530 Hz.What is the frequency heard by the driver of the lead car? (v_sound = 340 m/s)