Physics- Waves

Question 1

What is the wavespeed equation?

Answer 1

Wavespeed = frequency ✖️ wavelength 
V = f ✖️ lambda
m/s = Hz ✖️ m

Question 2

Rearrange the wavespeed equation to have frequency first?

Answer 2

Frequency = wavespeed ➗ wavelength 
f = v  ➗  lambda
Hz = m/s ➗ m

Question 3

Rearrange the wavespeed equation to have wavelength first?

Answer 3

Wavelength = wavespeed ➗ frequency 
Lambda = v ➗ f
m = m/s ➗ Hz

Question 4

What does amplitude mean?

Answer 4

The height of the wave measured from the middle ( the undisturbed position of the water if observing water )

Question 5

What is the wavelength?

Answer 5

The distance from one point on a wave to the equivalent point on the next wave

Question 6

What is the frequency of a wave?

Answer 6

The number of waves produced each second

Question 7

What is the period of a wave?

Answer 7

The time taken to produce a wave

Question 8

What is the difference between a wavelength and a wave period?

Answer 8

The wavelength is the distance of a wave where as the period is the time of a wave

Question 9

What is a wave?

And give a couple of examples

Answer 9

Regular disturbances which carry energy

sound waves, light waves, radio waves, water waves

Question 10

Top of the wave is called the …..?

Answer 10

Peak

Question 11

Bottom of the wave is called the ……?

Answer 11

Trough

Question 12

Refer to figure 1 in draw to check the diagram

Answer 12

.

Question 13

Why are mirrors good at reflecting light?

Answer 13

Mirrors have a very smooth shiny surface high enables light rays to reflect well

Question 14

State the law of reflection?

Answer 14

Angle of incidence = Angle of reflection

The angle of incidence and the angle of reflection are always measured between the light ray and the normal line

Question 15

When drawing a clear reflection ray diagram what equipment would you need? ( 2 objects )?

Answer 15

Ruler
Protractor

Remember the normal is at 90* to the surface

• = degrees

Question 16

What is refraction?

Answer 16

It’s when light hits the surface and moves direction.

Question 17

Light travels through transparent materials, why does refraction occur when light enters water?

( they both happen to be transparent materials )

Answer 17

Because they are different materials, ( when light travels from one transparent to another it changes direction = refraction )

Question 18

What is the angle called that sits between the incident line ( light ray ) and the normal line?

Answer 18

The angle of incidence

Question 19

Remembering that the normal line is at a right angle to the surface, which way will a light ray turn?

Answer 19

Towards the normal

When moving from (air > glass)or ( air > water)

Question 20

What is the angle called that sits between the refracted ray ( eg. The one bent in glass ) and the normal line?

Answer 20

Angle of refraction

Question 21

Which is bigger. The angle of incidence or refraction?

Answer 21

Angle of incidence is always bigger than the angle of refraction ( for a light ray hitting a glass block )

Question 22

When light comes out of glass into air the angle of refraction is BLANK than the angle of incidence.

Answer 22

Bigger

Question 23

Why does refraction happen?

Answer 23

Because the speed of movement of the light ray changes when it moves from one medium to another ( this is because the density of the new medium is different

Question 24

Light hits glass and slows down (angle of refraction is smaller than angle of incidence), what can happen when light leaves glass (to air)?

Answer 24

The light ray speeds up

The angle of refraction is bigger than the angle of incidence (it bends away from the normal)

Question 25

The incident light ray is ….. ?

Answer 25

The one approaching the medium

Question 26

When a light ray hits an object, name different things that could happen to it?

Answer 26

Refraction- changes direction
Transmitted though object- passes through
Reflection- away from the object

Question 27

Why does refraction occur when light hits a glass block?

Answer 27

The glass block is denser than air and causes the light to slow down

Question 28

T
A
G

Answer 28

Towards the normal going from …..
Air to ….
Glass

Question 29

A
G
A

Answer 29

Away from the normal going from …..
Glass into …..
Air

Question 30

Check diagrams for reflection and refraction

Answer 30

CHECK

Question 31

Is glass denser than air?

Answer 31

Yes

Question 32

Is water denser than air?

Answer 32

Yes