Sound Waves

Question 1

Juan is standing on the street. An ambulance moves toward him and then passes by.

Revolt · Accepted Answer

The pitch drops to a lower pitch once the ambulance passes by Juan.

Question 2

Noah and Nina are 15 m apart in a closed room. Noah says the same sentence twice. The first time, Nina does not hear the sound, but she does hear the sentence the second time.

Revolt · Accepted Answer

The air molecules in the compressions of the second wave are more dense, so the sound is louder.

Question 3

A source emits a sound and is represented by the red dot in this map. Four people are located around the source, and the circles represent the sound wave.

Revolt · Accepted Answer

person A

Question 4

A band director instructs students to play a pitch louder. How will the sound wave change when the band plays the same pitch louder?

Revolt · Accepted Answer

The amplitude of the sound wave will increase.

Question 5

Which voice can produce a pitch that has a speed of 343 m/s and a wavelength of 0.68 m? Check all that apply.

Revolt · Accepted Answer

contralto; soprano

Question 6

An illustration of a ringing bell and dots representing air molecules. The dots are close together, then far apart and close together again representing a longitudinal mechanical wave of sound going from the bell to an ear.

Revolt · Accepted Answer

four

Question 7

Which best explains why sound travels fastest through a solid?

Revolt · Accepted Answer

Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.

Question 8

The figure shows a sound wave as a function of time when the source is stationary with respect to the observer.

Revolt · Accepted Answer

An Illustration of a transverse wave and seven crests and seven troughs are labeled 1 s total.

Question 9

Sound will travel slowest through which medium?

Revolt · Accepted Answer

water at 55°C

Sound Waves Answers

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