Wave properties

Question 1

Unit for angles

Answer 1

Degree (°)

Question 2

Unit for frequency

Answer 2

Hertz (Hz)

Question 3

Unit for length

Answer 3

Metre (m)

Question 4

Unit for speed/velocity

Answer 4

Metre/second (m/s)

Question 5

Unit for time

Answer 5

Second (s)

Question 6

What is a longitudinal wave?

Answer 6

Vibrations or oscillations are along the direction in which the energy or wave is moving

Question 7

Examples of longitudinal waves?

Answer 7

Sound and ultrasounds
Shock waves (e.g. seismic waves)

Question 8

What is a transverse wave?

Answer 8

Transverse waves vibrations are 90° to the direction the energy is transferred by the wave

Question 9

Examples of transverse waves?

Answer 9

Light and EM spectrum waves
Ripples on water

Question 10

What is wavelength?

Answer 10

Is the distance of one peak to another on a wave

Question 11

What is frequency?

Answer 11

It’s how many complete waves there are per second

Question 12

What is amplitude?

Answer 12

It’s the height of the wave from the rest position to the crest

Question 13

What is a wavefront?

Answer 13

Is an imaginary plane that connects points on adjacent waves which are vibrating together

Question 14

What is the trough?

Answer 14

The lowest point of the wave

Question 15

What is the crest?

Answer 15

The highest point of the wave

Question 16

What is the rest position?

Answer 16

The middle of the wave going horizontal

Question 17

What is speed (in terms of waves)?

Answer 17

How fast the wave goes

Question 18

What is a wave?

Answer 18

A wave transfers energy and information without the overall transfer of matter

Question 19

What is the equation for wave speed (using frequency and wavelength)?

Answer 19

Wave speed = frequency x wavelength
v = f × λ

Question 20

What is the equation for frequency (using time period)?

Answer 20

Frequency = 1/Time period
F = 1/ T

Question 21

What does 1kHz equal?

Answer 21

1000Hz

Question 22

What does 1MHz equal?

Answer 22

1,000,000Hz

Question 23

What is the Doppler Effect?

Answer 23

It’s the change in frequency of waves as the source moves towards or away from the observer (which is stationary)

Question 24

What happens if an abject moves away from the stationary object (Doppler effect)?

Answer 24

The frequency is lower as the wavelength becomes longer

Question 25

What happens if an abject moves towards the stationary object (Doppler effect)?

Answer 25

The frequency is higher as the wavelength becomes shorter

Question 26

What does a lower frequency and longer wavelength do to the pitch?

Answer 26

It lowers the pitch

Question 27

What does a higher frequency and shorter wavelength do to the pitch?

Answer 27

It makes the pitch higher

Question 28

What can all waves do?

Answer 28

They can all be reflected and refracted

Question 29

Where are the compressions and rarefactions in a longitudinal wave?

Answer 29

Rarefactions are where the wave is stretched out the most
Compressions are waves are the closest to eachother