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# College Physics Reasoning and Relationships

Physics & Astronomy

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## Quiz 13 : Sound

How far away is a lightning bolt if it takes 20 s for the sound of the associated thunder to reach the observer?
Free
Multiple Choice

B

Material 1 has Young's modulus and density , and material 2 has Young's modulus and density . If is 30% more than and is 30% less than , which material has the higher speed of sound and how much higher is it?
Free
Multiple Choice

A

Which of the following ranges corresponds to the shortest wavelengths?
Free
Multiple Choice

C

Material 1 has Young's modulus and density , material 2 has Young's modulus and density , and material 3 has Young's modulus and density . If and if , which material has the highest speed of sound?
Multiple Choice
When a sine wave is used to represent a sound wave, the crest corresponds to:
Multiple Choice
Which of the following best describes a sound level of intensity 10-6 W/m2?
Multiple Choice
When a sound wave moves through a medium such as air, the motion of the molecules of the medium is in what direction (with respect to the motion of the sound wave)?
Multiple Choice
The density of a certain solid is 7.2 103 kg/m3, and its Young's modulus is 8.0 1010 N/m2. What is the speed of sound in this material?
Multiple Choice
A sound wave in air has a frequency of 515 Hz and a wavelength of 0.68 m. What is the air temperature?
Multiple Choice
Consider a vibrating guitar string that makes a sound wave that moves through the air. As the string moves up and down, the air molecules that are a certain horizontal distance from the string will move:
Multiple Choice
The speed of sound in air is a function of which one of the following?
Multiple Choice
What is the intensity level of a sound with intensity of 5.0 1011 W/m2? (I0 = 1012 W/m2)
Multiple Choice
Doubling the power output from a speaker emitting a single frequency will result in what increase in loudness?
Multiple Choice
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.)
Multiple Choice
Comparing the speed of sound in liquids, gases, and solids, the speed of sound is usually lowest in _____ and highest in _____.
Multiple Choice
How far away is a lightning strike if you hear the thunderclap 2.00 s after you see the lightning bolt strike? (vsound = 340 m/s, vlight = 3 108 m/s)
Multiple Choice