Pretest

Question 1

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. What best describes the difference between the second sound wave and the first?

Revolt · Accepted Answer

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

Question 2

What two factors affect the speed of a sound wave as it travels through a medium?

Revolt · Accepted Answer

the type of medium and the temperature of the medium

Question 3

The diagrams show the sound waves produced in one second from various tuning forks. Which sound wave has the lowest pitch?

Revolt · Accepted Answer

Image with description An illustration of a tuning fork with lines parallel to the fork moving out. The lines start out farther apart, get closer together and then farther apart again.

Question 4

What best describes a sound wave?

Revolt · Accepted Answer

longitudinal and mechanical

Question 5

Which diagram best shows the perceived sound wave heard by a woman after a police car has passed her?

Revolt · Accepted Answer

Image with description An illustration of a person listening to the siren of a passing police car. There are circles spreading out from the siren with the wavelength close together in the front and farther apart in the back.

Question 6

A sound wave travels through air. In which regions are air molecules the least dense?

Revolt · Accepted Answer

rarefactions

Question 7

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?

Revolt · Accepted Answer

Doppler effect

Question 8

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 9

Sound will travel slowest through which medium?

Revolt · Accepted Answer

water at 55 times degree C

Pretest Answers

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