Waves

Question 1

If light enters a new material and slows down is the angle of refraction bigger or smaller than the angle of incidence?

Answer 1

Smaller than

Question 2

If light enters a new material and speeds up is the angle of refraction bigger or smaller than the angle of incedence?

Answer 2

Bigger than

Question 3

TRUE OR FAULSE
The speed of light always changes

Answer 3

TRUE

Question 4

TRUE OR FAULSE
The speed of light sometimes changes

Answer 4

FAULSE

Question 5

TRUE OR FAULSE
The direction of light always changes

Answer 5

FAULSE

Question 6

TRUE OR FAULSE
The direction of light sometimes changes

Answer 6

TRUE

Question 7

Where will the light go in a:
Glass rectangle block
0 degrees (along the normal)

Answer 7

Pass straight through

Question 8

Where will the light go in a:
Glass rectangle block
Angle greater than 0 degrees

Answer 8

Change direction

Question 9

Where will the light go in a:
Glass semi circle block
Enters the round block side

Answer 9

Direction changes when it leaves the glass block

Question 10

Where will the light go in a:
Glass semi circle block
Enters the flat block side

Answer 10

It will change direction and pass straight through the round edge of the block

Question 11

Where will the light go in a:
Glass triangular prism block
Greater than 0 degrees

Answer 11

Change direction. Bend towards normal and then bend away from the normal.

Question 12

What do waves do?
What is wavespeed?

Answer 12

• Waves transfer energy
• Wave speed refers to the speed at which a wave travels through a medium

Question 13

When does diffraction occur?

Answer 13

Pass through a gap or around an object

Question 14

Longer wavelength waves have … diffraction than … wavelengths. So longer waveengths diffract … than … wavelengths.

Answer 14

Greater
Shorter
Shorter
More

Question 15

EM

What has a longest wavelength

Answer 15

Radio waves

Question 16

EM

What has the shortest wavelength

Answer 16

Gamma Rays

Question 17

EM

What has the highest frequency

Answer 17

Gamma Rays

Question 18

EM

What has the lowest fequency

Answer 18

Radio waves

Question 19

All radiations in the electromagnetic spectrum are … waves and travel at the speed of … which is …

Answer 19

Transverse
Light
3 X 10 8 m/s

Question 20

What is refraction?

Answer 20

Refraction occurs when waves pass from one medium to another

Question 21

Describe refraction in terms of change of wave speed

Answer 21

Refraction is the change of speed of a wave as it passes from one material to another

Question 22

Dense

Describe the change in wavelength

Answer 22

Air to glass the wavelength will decrease.
More dense to less dense the wavelenght increases.

Question 23

Describe the change of direction (angle is greater than 0 degrees)

Answer 23

Light will only change direction when it strikes an object at an angle of instadence greater than 0 degrees. Pass through normal mean straight.

Question 24

Going from a less dense to more dense then your light will refract or bend …

Answer 24

towards the normal

Question 25

Going from a **more** dense **to less dense** then the light will refract or bend ...

Answer 25

**Away** from the normal

Question 26

Longitudinal Wave

Answer 26

A longitudinal wave is one where the particles vibrate along the same direction of the wave

Question 27

Transverse Wave

Answer 27

A transverse wave is one where the particle moves at right angles (90 degrees) to the direction of travel of the wave.

Question 28

Frequency

Answer 28

The number of waves per second or number of waves passing a point per second.

Question 29

Period

Answer 29

The time taken for one wave to pass a point. (Inverse of the frequency.)

Question 30

Diffraction

Answer 30

The bending of waves through gaps or around objects

Question 31

Refraction

Answer 31

The **change** in **speed of light as it passes from one medium to another** (e.g. from air to glass)