Question 1

-In the figure above,some wavefronts are emitted by a source of sound S.This picture can help us to understand

Accepted Answer

A) why the siren on a police car changes its pitch as it races past us. 
B) why a sound grows quieter as we move away from the source. 
C) how sonar works. 
D) the phenomenon of beats. 
E) why it is that our hearing is best near 3000 Hz. 
A) why the siren on a police car changes its pitch as it races past us. 
B) why a sound grows quieter as we move away from the source. 
C) how sonar works. 
D) the phenomenon of beats. 
E) why it is that our hearing is best near 3000 Hz.

Question 2

A string,2.0 meters in length,is fixed at both ends and tightened until the wave speed is 78 m/s.What is the frequency of the standing wave shown in the figure?

Accepted Answer

A) 120 Hz 
B) 230 Hz 
C) 350 Hz 
D) 470 Hz 
A) 120 Hz 
B) 230 Hz 
C) 350 Hz 
D) 470 Hz

Question 3

Two loudspeakers placed 6.0 m apart are driven in phase by an audio oscillator,whose frequency range is 1595 Hz to 2158 Hz.A point P is located 4.7 m from one loudspeaker and 3.6 m from the other.The speed of sound is 344 m/s.The frequency produced by the oscillator,for which destructive interference occurs at point P,in SI units,is closest to:

Accepted Answer

A) 2033 
B) 2127 
C) 2095 
D) 2064 
E) 2001 
A) 2033 
B) 2127 
C) 2095 
D) 2064 
E) 2001

Question 4

When a guitar is tuned,what is it that is changed?

Accepted Answer

A) The wavelength of the fundamental. 
B) The frequency of the fundamental. 
C) The amplitude of the fundamental. 
A) The wavelength of the fundamental. 
B) The frequency of the fundamental. 
C) The amplitude of the fundamental.

Question 5

A 4.0 g string,0.39 m long,is under tension.The string produces a 600 Hz tone when it vibrates in the third harmonic.The speed of sound in air is 344 m/s.The tension in the string,in SI units,is closest to:

Accepted Answer

A) 250 
B) 200 
C) 160 
D) 290 
E) 340 
A) 250 
B) 200 
C) 160 
D) 290 
E) 340

Question 6

A gamma ray (a pulse of electromagnetic energy)has a frequency of 2.42 F1F1F1S1F1F1F10 1020 Hz.What is the ratio of its wavelength to the radius of the nucleus which produced it (radius = 5.0 F1F1F1S1F1F1F10 10-13 cm)?

Accepted Answer

A) 248 
B) 39.4 
C) 1.21 × 108 
D) 0.015 
A) 248 
B) 39.4 
C) 1.21 × 108 
D) 0.015

Question 7

A guitar-like stringed instrument has a string that is 20 cm long.It sounds the musical note A (440 Hz)when played without fingering.How far from the end of the string should you place your finger to play the note C (523 Hz)?

Accepted Answer

A) 3.2 cm 
B) 2.1 cm 
C) 4.2 cm 
D) 5.2 cm 
A) 3.2 cm 
B) 2.1 cm 
C) 4.2 cm 
D) 5.2 cm

Question 8

A standing wave is oscillating at 690 Hz on a string,as shown in the figure.What is the wave speed?

Accepted Answer

A) 280 m/s 
B) 410 m/s 
C) 210 m/s 
D) 140 m/s 
A) 280 m/s 
B) 410 m/s 
C) 210 m/s 
D) 140 m/s

Question 9

Situation 16.1
A standing wave of the third overtone is induced in a stopped pipe,1.2 m long.The speed of sound is 340 m/s.
-In Situation 16.1,the frequency of the sound produced by the pipe,in SI units,is closest to:

Accepted Answer

A) 210 
B) 280 
C) 350 
D) 430 
E) 500 
A) 210 
B) 280 
C) 350 
D) 430 
E) 500

Question 10

A string,0.15 m long,vibrating in the n = 5 harmonic,excites an open pipe,0.82 m long,into second overtone resonance.The speed of sound in air is 345 m/s.The distance between a node and an adjacent antinode,in the string,in mm,is closest to:

Accepted Answer

A) 15 
B) 7.5 
C) 23 
D) 30 
E) 150 
A) 15 
B) 7.5 
C) 23 
D) 30 
E) 150

Question 11

A 0.335 m string is clamped at both ends.If the lowest standing wave frequency in the string is 326 Hz,what is the wave speed?

Accepted Answer

A) 218 m/s 
B) 270 m/s 
C) 331 m/s 
D) 412 m/s 
A) 218 m/s 
B) 270 m/s 
C) 331 m/s 
D) 412 m/s

Question 12

If one speaker emits a wave crest at the same time that another one emits a wave trough,these speakers are π/2 out of phase with each other.

Accepted Answer

A) True 
 B)False

Question 13

An open pipe,0.92 m long,vibrates in the second overtone with a frequency of 584 Hz.In this situation,the speed of sound in air,in SI units,is closest to:

Accepted Answer

A) 358 
B) 349 
C) 353 
D) 344 
E) 363 
A) 358 
B) 349 
C) 353 
D) 344 
E) 363

Question 14

A 4.0 g string,0.36 m long,is under tension.The string produces a 500 Hz tone when it vibrates in the third harmonic.The speed of sound in air is 344 m/s.In this situation,the wavelength of the standing wave in the string,in SI units,is closest to:

Accepted Answer

A) 0.24 
B) 0.36 
C) 0.54 
D) 0.72 
E) 0.90 
A) 0.24 
B) 0.36 
C) 0.54 
D) 0.72 
E) 0.90

Question 15

If the fourth harmonic for a string fixed at both ends is 220 Hz,the fundamental frequency for this string is 880 Hz.

Accepted Answer

A) True 
 B)False

Question 16

A string,0.13 m long,vibrating in the n = 4 harmonic,excites an open pipe,0.88 m long,into second overtone resonance.The speed of sound in air is 345 m/s.The velocity of transverse waves in the string,in SI units,is closest to:

Accepted Answer

A) 38 
B) 36 
C) 34 
D) 32 
E) 30 
A) 38 
B) 36 
C) 34 
D) 32 
E) 30

Question 17

Situation 16.1
A standing wave of the third overtone is induced in a stopped pipe,1.2 m long.The speed of sound is 340 m/s.
-In Situation 16.1,the number of antinodes in the standing wave pattern is:

Accepted Answer

A) 3 
B) 4 
C) 5 
D) 6 
E) 7 
A) 3 
B) 4 
C) 5 
D) 6 
E) 7

Question 18

A tube open at one end and closed at the other produces sound of fundamental frequency of 350 Hz.If you now open the closed end,the fundamental frequency becomes 175 Hz.

Accepted Answer

A) True 
 B)False

Question 19

Calculate the light intensity 1.45 m from a 100.0 W light bulb.Assume that the light radiates equally in all directions.

Accepted Answer

A) 3.79 W/m2 
B) 4.36 W/m2 
C) 47.6 W/m2 
D) 54.7 W/m2 
A) 3.79 W/m2 
B) 4.36 W/m2 
C) 47.6 W/m2 
D) 54.7 W/m2

Question 20

If a tube filled with air and closed at both ends is 1.60 m long,the longest possible wavelength of the standing waves in this tube is 1.60 m.

Accepted Answer

A) True 
 B)False

Exam 16: Superposition and Standing Waves

-In the figure above,some wavefronts are emitted by a source of sound S.This picture can help us to understand

A string,2.0 meters in length,is fixed at both ends and tightened until the wave speed is 78 m/s.What is the frequency of the standing wave shown in the figure?

When a guitar is tuned,what is it that is changed?

A 4.0 g string,0.39 m long,is under tension.The string produces a 600 Hz tone when it vibrates in the third harmonic.The speed of sound in air is 344 m/s.The tension in the string,in SI units,is closest to:

A gamma ray (a pulse of electromagnetic energy)has a frequency of 2.42  1020 Hz.What is the ratio of its wavelength to the radius of the nucleus which produced it (radius = 5.0  10-13 cm)?

A guitar-like stringed instrument has a string that is 20 cm long.It sounds the musical note A (440 Hz)when played without fingering.How far from the end of the string should you place your finger to play the note C (523 Hz)?

A standing wave is oscillating at 690 Hz on a string,as shown in the figure.What is the wave speed?

Situation 16.1 A standing wave of the third overtone is induced in a stopped pipe,1.2 m long.The speed of sound is 340 m/s. -In Situation 16.1,the frequency of the sound produced by the pipe,in SI units,is closest to:

A string,0.15 m long,vibrating in the n = 5 harmonic,excites an open pipe,0.82 m long,into second overtone resonance.The speed of sound in air is 345 m/s.The distance between a node and an adjacent antinode,in the string,in mm,is closest to:

A 0.335 m string is clamped at both ends.If the lowest standing wave frequency in the string is 326 Hz,what is the wave speed?

If one speaker emits a wave crest at the same time that another one emits a wave trough,these speakers are π/2 out of phase with each other.

An open pipe,0.92 m long,vibrates in the second overtone with a frequency of 584 Hz.In this situation,the speed of sound in air,in SI units,is closest to:

A 4.0 g string,0.36 m long,is under tension.The string produces a 500 Hz tone when it vibrates in the third harmonic.The speed of sound in air is 344 m/s.In this situation,the wavelength of the standing wave in the string,in SI units,is closest to:

If the fourth harmonic for a string fixed at both ends is 220 Hz,the fundamental frequency for this string is 880 Hz.

A string,0.13 m long,vibrating in the n = 4 harmonic,excites an open pipe,0.88 m long,into second overtone resonance.The speed of sound in air is 345 m/s.The velocity of transverse waves in the string,in SI units,is closest to:

Situation 16.1 A standing wave of the third overtone is induced in a stopped pipe,1.2 m long.The speed of sound is 340 m/s. -In Situation 16.1,the number of antinodes in the standing wave pattern is:

A tube open at one end and closed at the other produces sound of fundamental frequency of 350 Hz.If you now open the closed end,the fundamental frequency becomes 175 Hz.

Calculate the light intensity 1.45 m from a 100.0 W light bulb.Assume that the light radiates equally in all directions.

If a tube filled with air and closed at both ends is 1.60 m long,the longest possible wavelength of the standing waves in this tube is 1.60 m.

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Filters

A gamma ray (a pulse of electromagnetic energy)has a frequency of 2.42  10²⁰ Hz.What is the ratio of its wavelength to the radius of the nucleus which produced it (radius = 5.0  10^-13 cm)?