A

Question 1

Define compression

Answer 1

An area where particles are bunched close

Question 2

Define rarefaction

Answer 2

An area where the particles are spread out

Question 3

Define wavelength

Answer 3

Distance between successive waves

Question 4

Define frequency

Answer 4

The number of waves that pass a point in one second

Question 5

What does sound need to travel

Answer 5

Medium- solid liquid or gas

Question 6

Can sound travel in space / vacuum

Answer 6

No

Question 7

How does sound travel through mediums

Answer 7

In longitudinal waves

Question 8

Longitudinal waves

Answer 8

When wave travels to side and so do the particles

Question 9

Transverse wave

Answer 9

Wave travels to side and particles vibrate up and down

Question 10

What is used to compare sounds

Answer 10

Cro

Question 11

Which source produces a higher pitch or frequency

Answer 11

A source which vibrates rapidly

Question 12

What is frequency measure in

Answer 12

Hertz Hz

Question 13

Why does sound travel through solids faster

Answer 13

This is because the particles in a solid are packed closer together and the closer particles are in a medium the faster sound waves travel through it- shorter distance between particles

Question 14

What is loudness measured by

Answer 14

Decibels dB

Question 15

What does noise destroy in the ear

Answer 15

Sensory sells also known as hair cells

Question 16

Causes of hearing loss

Answer 16

Constant exposure to noises over 85dB
Ear wax blockage
Raptured eardrum
Water in inner ear

Question 17

What do hair cells do

Answer 17

Send signals to the brain they cannot be replaces

Question 18

NIHL

Answer 18

Noise induced hearing loss

Question 19

Ways to reduce noise in workplace

Answer 19

Replace outdated equipment
Use sound padding for walls and ceiling
Use ear protection

Question 20

What is the Doppler effect

Answer 20

An increase or decrease in frequency of sound wVes depending on distance of observer. Further the lower the frequency the closer the higher frequency

Question 21

What is an ultrasound

Answer 21

Sound waves with frequency above human hearing range. When waves pass through fluid and soft tissue to deflect off layer from organ to create an image from the echos of the waves using computer analysis

Question 22

Frequencies involved with ultrasound

Answer 22

Frequencies higher than 20,000 Hz or 20kHz

Question 23

Define amplitude

Answer 23

A measure of how far the particle moves from it’s starting position

Question 24

Define transmit

Answer 24

To move a sound from one place to another