Unit 4.2

Question 1

Decibel (dB)

Answer 1

Unit used to measure loudness

Question 2

Compression

Answer 2

A region of high pressure where particles are close together

Question 3

Echo

Answer 3

A sound that is reflected and heard a second time

Question 4

Frequency

Answer 4

The number of waves passing a point every second

Question 5

Hertz (Hz)

Answer 5

The unit used to measure frequency

Question 6

Infrasound

Answer 6

The sounds produced by waves of very low frequency, less than 20 Hz

Question 7

Longitudinal wave

Answer 7

A wave in which the vibration is in the same direction that the wave is travelling

Question 8

Rarefaction

Answer 8

A region of low pressure, in which particles are far apart

Question 9

Sound wave

Answer 9

Regions of high and low pressure originating from a vibrating object and transmitted through a medium

Question 10

Tinnitus

Answer 10

Constant ringing in the ears caused by prolonged exposure to loud sounds

Question 11

Transverse wave

Answer 11

A wave in which the vibration is at right angles to the direction the wave is travelling

Question 12

Wave length

Answer 12

The distance from one peak of a wave to the next

Question 13

Ultrasound

Answer 13

The sounds produced by waves of greater frequency than humans can hear (greater than 20,000 Hz)