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Exam 14: Sound

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Question 21

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The intensity level of sound 20 m from a jet airliner is 120 dB.At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)

A) 90 m
B) 120 m
C) 150 m
D) 200 m

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Question 22

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The speed of sound at 0 $\degree$ C is 331 m/s.What is the speed of sound at 25 $\degree$ C? (0 $\degree$ C = 273 K)

A) 346 m/s
B) 356 m/s
C) 343 m/s
D) 350 m/s

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Question 23

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The frequency separating audible waves and ultrasonic waves is considered to be 20 kHz.What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 340 m/s.)

How far away is a lightning bolt if it takes 10 s for the sound of the associated thunder to reach the observer?

A bat, flying at 5.00 m/s toward a wall, emits a chirp at 50.0 kHz.If the wall reflects this sound pulse, what is the frequency of the echo received by the bat? (v_sound = 340 m/s)

Tripling the distance between sound source and a listener will change the intensity, as detected by the listener, by what factor?

The lower A on a piano has a frequency of 27.5 Hz.If the tension in the 2.0-m-long string is 304 N and one-half wavelength occupies the string, what is the mass of the string?

Two tuning forks sounding together result in a beat frequency of 3 Hz.If the frequency of one of the forks is 256 Hz, what is the frequency of the other?

Which of the following best describes a sound level of intensity 1 W/m²?

How far away is a lightning strike if you hear the thunderclap 3.00 s after you see the lightning bolt strike? (v_sound = 340 m/s, v_light = 3 * 10⁸ m/s)

A 100-m-long high-voltage cable is suspended between two towers.The mass of the 100-m cable is 150 kg.If the tension in the cable is 30 000 N, what is the lowest frequency at which this cable can oscillate?

If the distance between a point sound source and a dB detector is increased by a factor of 4, what will be the reduction in intensity level?

When the standing wave pattern in a pipe is NANA, the pipe has which of the following set of properties? (N stands for node, A for antinode.)

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

Which of the following ranges corresponds to the longest wavelengths?

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

When I stand halfway between two speakers, with one on my left and one on my right, a musical note from the speakers gives me constructive interference.How far to my left should I move to obtain destructive interference?

A phase difference of 270 $\degree$ corresponds to what wavelength difference?

When two sound waves are out of phase by ____, destructive interference will occur.

If a guitar string has a fundamental frequency of 500 Hz, what is the frequency of its second overtone?