P5- Waves

Question 1

What do waves transfer

Answer 1

Waves transfer engery but not matter

Question 2

On a displacement distance graph what does displacement show

Answer 2

How far from the equilibrium point (the middle) the wave has oscillated

Question 3

How is the amplitude measured on a displacement distance graph

Answer 3

The maxium displacement from the equilibrium

Question 4

What is wavelength

Answer 4

The distance of one oscillation of a wave

Question 5

Where do you measure wavelength on a wave

Answer 5

• From ‘crest’ to ‘crest’ (the peaks)
• From the equilibrium (up down and back up)

Question 6

What is freaquency measured in

Answer 6

Hz
Hertz

Question 7

What is freaquency

Answer 7

The number of complete oscillations per second

Question 8

What is the equation for freaquency of a wave

Answer 8

F= 1/T

Question 9

How do you work out wave speed

Answer 9

Wavespeed= Frequency x Wavelength

Question 10

What is wave speed measured in

Answer 10

m/s
Meters/ second

Question 11

What are transversal waves

Answer 11

Oscillations are perpendicular to the direction of engery transfer
(wave goes up and down)

Question 12

What are examples of transverse waves

Answer 12

• Electromagnetic spectrum
• Water waves
• Guitar strings

Question 13

What type of waves are light waves

Answer 13

Transversal

Question 14

What are longitudinal waves

Answer 14

Oscillations are parrallel to the direction of engery
(Spread out and compressed bits)

Question 15

What type of waves are sound waves

Answer 15

Longitudinal

Question 16

What are some examples of longitudinal waves

Answer 16

• Sound waves
• Some shock waves

Question 17

What 3 things can happen when a wave meets a boundry between materials

Answer 17

• Absourbed (engery taken in)
• Reflected (bounced off)
• Transmitted (goes through)

Question 18

What are diagrams of waves called

Answer 18

Ray diagrams

Question 19

What is the main rule in reflection

Answer 19

Angle of incidence = Angle of reflection

Question 20

How is the normal line drawn in a Ray diagram

Answer 20

• Dashed
• Perpendicular to the boundry (90 degrees)

Question 21

What is the normal line used for

Answer 21

To measure the angle of incidence

Question 22

What is the ‘point of incidence’

Answer 22

The place where the incoming ray touches the boundry

Question 23

What is specular reflection

Answer 23

When the boundry is flat so all of the normal lines are parallel so all of the light rays are reflected in the same direction

Question 24

What type of image does specular reflection produce

Answer 24

A clear image (like you see in a mirror)

Question 25

What is diffuse/ scattered reflection

Answer 25

When the boundry is bumpy so the normal lines are not parallel which means that the light rays are reflected in different directions

Question 26

What type of image does diffuse reflection prouduce

Answer 26

A matte surface- you cannot see a reflection clearly

Question 27

What happens to the speed of a wave when it enters a different material

Answer 27

It can change speed

Question 28

Why do waves change speed when they move into different materials

Answer 28

Because the materials have different densities

Question 29

How does density effect a light wave

Answer 29

Denser materials = Slower wavespeed