Light and Sound

Question 1

What does the fact that light can be polarised confirm about the way light can be modelled?

Answer 1

Light can be modelled as a transverse wave

Question 2

Which type of electromagnetic radiation has the shortest wavelength?

Answer 2

Radio Waves

Question 3

What does the brightness of a light source depend on?

Answer 3

The amplitude of the electromagnetic wave

Question 4

List the electromagnetic spectrum in order of increasing frequency?

Answer 4

1. Radio Waves 2. Microwaves 3. Infrared 4. Visible Light

5. Ultraviolet 6. X-Rays 7. Gamma Rays

Question 5

What is the approximate wavelength of red?

Answer 5

700

Question 6

What is the approximate wavelength of yellow?

Answer 6

580

Question 7

What is the approximate wavelength of green?

Answer 7

525

Question 8

What is the approximate wavelength of blue?

Answer 8

460

Question 9

What is the approximate wavelength of violet?

Answer 9

410

Question 10

What best summarises the laws of reflection?

Answer 10

The angle of incidence is equal to the angle of reflection

Question 11

What can waves travel through?

Answer 11

Air, solids, liquids and space

Question 12

Which waves require a medium?

Answer 12

Mechanical waves, non-mechanical waves do not

Question 13

What does wave motion transfer?

Answer 13

Energy from one point to another often with no transfer of the material of the medium

Question 14

What are sections that are pushed together in longitudinal waves called?

Answer 14

Compressions

Question 15

What are sections that are stretched out in longitudinal waves called?

Answer 15

Rarefaction

Question 16

What is the high point of a transverse wave called?

Answer 16

Crest

Question 17

What is the low point of a transverse wave called?

Answer 17

Trough

Question 18

What do convex mirrors do?

Answer 18

They reflect light so that it looks to be diverging from a point behind the mirror

Question 19

What do concave mirrors do?

Answer 19

The greater curvature of the mirror, the shorter the focal length

Question 20

What is sound caused by?

Answer 20

Vibration

Question 21

What is sound?

Answer 21

A mechanical wave, caused by an oscillation through solid, liquid or gas

Question 22

What is the speed of light through air?

Answer 22

300,000 kms/second

Question 23

What is the connection between the number of waves and the pitch of the sound?

Answer 23

The more the number of waves, the higher the pitch of the sound

Question 24

What do all plane mirrors show?

Answer 24

A virtual image of the same size

Question 25

Which type of lens is required for hyperopia (long-sightedness)

Answer 25

Convex Lens

Question 26

Which type of lens is required for myopia (short-sightedness)

Answer 26

Concave Lens

Question 27

Where does light bend when it leaves the perspex block?

Answer 27

Away from the normal

Question 28

Where does light bend when it enters the perspex block?

Answer 28

Towards the normal

Question 29

What does the law of refraction state?

Answer 29

When light enters a more optically dense medium it slows down and bends towards the normal

Question 30

What else does the law of refraction state?

Answer 30

When light enters a less optically dense medium it speeds up and bends away from the normal

Question 31

What is dispersion?

Answer 31

The process responsible for the spectrum that emerges from a triangular prism