Chapter 10 Study Guide Blanks

Question 1

Sound travels faster through () and liquids rather than () because the individual molecules are () together.

Answer 1

solids; air; closer

Question 2

When you turn down the volume on the television, you reduce the () carried by the sound waves, so you can also reduce their ().

Answer 2

intensity; amplitude

Question 3

As the frequency of a sound wave decreases, the pitch becomes ().

Answer 3

lower

Question 4

When two instruments play at the same time, the sound waves produced by each instrument ().

Answer 4

construct

Question 5

Sound frequencies are measured in ().

Answer 5

Hertz

Question 6

Sounds above () dB may cause pain and permanent hearing loss.

Answer 6

90

Question 7

The () to an object can be calculated by measuring how much time passes between emitting the sound pulse and receiving the reflected signal.

Answer 7

distance

Question 8

Sustained sounds above () dB can cause permanent hearng loss.

Answer 8

90

Question 9

Each string on a guitar has a different set of ().

Answer 9

natural frequencies

Question 10

An instrument vibrates at many different frequencies at once, causing you to hear ().

Answer 10

multiple pitches

Question 11

Sound waves are collected and concentrated by the ().

Answer 11

outer ear

Question 12

Some people work in noisy areas. Which of the following would be the best way to help protect a person’s hearing from damage when exposed to a loud work environment?

Answer 12

Using earbuds to block the eardrum

Question 13

Waves transfer energy through a variety of different media. A sound wave’s energy is transferred from the air and into a solid at the ().

Answer 13

Eardrum

Question 14

How does the density of a medium affect the speed of sound?

Answer 14

Greater density = Greater speed
Lesser density = Lesser speed

Question 15

() influences how far away a sound can be heard.

Answer 15

Intensity

Question 16

Sound intensity is measured using the () scale.

Answer 16

decibel

Question 17

The () occurs when the source of a sound wave is moving relative to the listener.

Answer 17

Doppler effect

Question 18

() is made of sounds that are deliberately used in regular pattern.

Answer 18

Music

Question 19

() can occur when sound waves of different frequencies combine.

Answer 19

Beats

Question 20

You are sitting outside when you hear a siren. The pitch becomes lower as you it there. What conclusions can you draw about the source of the sound?

Answer 20

Lower frequency = Lower pitch
Doppler effect; sound is further moving away