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Exam 14: Sound

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Question 1

Multiple Choice

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

A) extremely loud
B) about that of a power mower
C) normal conversation
D) like a whisper

E) A) and B)
F) None of the above

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Question 2

Multiple Choice

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In which part of the ear is the cochlea?

A) outer ear
B) middle ear
C) inner ear
D) ear canal

E) A) and D)
F) B) and C)

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C

Question 3

Multiple Choice

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What is the intensity level of a sound with intensity of 5.0 x 10^-10 W/m²? (I₀ = 10^-12 W/m²)

A standing wave is set up in a 200-cm string fixed at both ends.The string vibrates in 5 distinct segments when driven by a 120-Hz source.What is the wavelength?

The term "timbre" refers to which of the following?

What is the intensity of a sound with a measured intensity level of 84 dB? (I₀ = 10^-12 W/m²)

The number of overtones,and their relative intensities,is associated with what property of the tone generated by a musical instrument?

I stretch a rubber band and "plunk" it to make it vibrate in its fundamental frequency.I then stretch it to twice its length and make it vibrate in the fundamental frequency once again.The rubber band is made so that doubling its length doubles the tension and reduces the mass per unit length by a factor of 2.The new frequency will be related to the old by a factor of:

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 standing wave is set up in a 2.0-m string fixed at both ends.The string vibrates in 5 distinct segments when driven by a 120-Hz source.In how many distinct standing wave segments will the string vibrate if the tension is increased by a factor of 4?

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 x 10⁸ m/s)

A series of ocean waves,5.0 m between crests,move past at 2.0 waves/s.Find their speed.

If I₀ = 10^-12 W/m² is the threshold of hearing,a sound with intensity I₁ = 10^-11 W/m² will give a certain decibel level.Suppose a new sound has an intensity I₂ = I₁²/I₀.What is the new decibel level?

Assuming that the wave speed varies little when sound waves are traveling though a material that suddenly changes density by 10%,what percentage of the incident wave intensity is reflected?

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

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)

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. )

The air in a tube open at both ends is sent into its fundamental resonance.One end of the tube is then closed and the air column is again set into its fundamental resonance.The resonant frequency ____ after the end is closed.

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?

Tripling the power output from a speaker emitting a single frequency will result in what increase in loudness?