Light & Sound

Question 1

Name the properties of light

Answer 1

• it is a form of energy
• it travels as a wave, electromagnetic wave
• reflects off surfaces
• speed of light 300 000 km per second

Question 2

When light hits a surface it may be

Answer 2

• transmitted through it
• reflected off it
• absorbed into it

Question 3

What is the law of reflection

Answer 3

Angle of incidence = angle of reflection

i = r

Question 4

What is refraction

Answer 4

Refraction is the bending of light

Question 5

Higher refraction index means

Answer 5

That light bends towards the normal

Question 6

Lower refractive index

Answer 6

Light bends away from the normal

Question 7

Concave lenses

Answer 7

A lens that curves inwards. This causes light to diverge, or spread. They spread parallel light rays as though the rays have come from a point behind he lens. Only produces images that are smaller , upright and virtual.

Question 8

Convex lenses

Answer 8

A lens that is thicker at the centre. They cause light rays to come together, or converge. This is also know as a magnifying glass when held close to an object.

Question 9

ROYGBIV

Answer 9

Red 
Orange 
Yellow
Green 
Blue
Indigo
Violet

Question 10

How can white light be turned into a rainbow

Answer 10

When a white light is refracted through triangular prism crystal or drop of water

Question 11

How is sound produced

Answer 11

Vibration

Question 12

How does sound travel

Answer 12

Longitudinal waves

Question 13

Frequency

Answer 13

The numbers of waves passing a point every second

Hertz - measurement

High f = high pitch
Low f = low pitch

Question 14

Amplitude

Answer 14

The force of a compression

Low a = soft sound
High a = loud sound

Question 15

Longitudinal wave

Answer 15

A wave in which the vibration is in the same direction that the wave is traveling

Question 16

Compression

Answer 16

A region of high pressure where particles are close together

Question 17

Rarefaction

Answer 17

A region of low pressure in which particles are far apart

Question 18

Transverse wave

Answer 18

A wave where the vibration is at right angles to the direction the wave is traveling

Beach wave up and down

Question 19

Angle of incidence

Answer 19

An angle the incoming Ray makes with the the normal

Question 20

Angle of reflection

Answer 20

The angle a reflected Ray makes with the the normal

Question 21

Angle of refraction

Answer 21

The angle the refracted Ray makes with the normal

Question 22

Diffuse reflection

Answer 22

Reflection of light in many directions from an uneven surface

Question 23

Incident Ray

Answer 23

Incoming Ray

Question 24

Refractive index

Answer 24

A measure of how easily light passes through a substance

Question 25

Regular reflection

Answer 25

Reflection of light from a smooth surface such as still water or mirror. Produces clear image

Question 26

Cornea

Answer 26

A transparent covering over the iris. It bends light into the lens

Question 27

Focal length

Answer 27

The distance from a lens to its focus

Question 28

Lens

Answer 28

In the eye it is a flexible structure the enables light to be focused on the retina

Question 29

Long - sightedness | Hyperopia

Answer 29

Inability to focus on close objects because the eyeball is to long

Question 30

Optic nerve

Answer 30

A nerve that carries that carries an electrical signal from the retina to the brain

Question 31

Real image

Answer 31

An image formed when rays of light actually meet

Question 32

Retina

Answer 32

Nerve tissue at the back of the eye. Consists of cone and rod cells, light is converted into an electrical signal here

Question 33

Short - sightedness | Myopia

Answer 33

Inability to focus on long distant objects as the eyeball is to small

Question 34

Pupil

Answer 34

An opening in the iris that determines the amount of light entering the eye

Question 35

Sclera

Answer 35

White of the eye

Question 36

Iris

Answer 36

Coloured part of the eye

Question 37

Aqueous humour

Answer 37

Water fluid produced by the ciliary body to lubricate the lens and cornea

Question 38

Vitreous humour

Answer 38

Clear fluid between the lens and retina

Question 39

What is the top of the wave called

Answer 39

Crest

Question 40

What is the bottom of the wave called

Answer 40

Trough

Question 41

What are the primary colours

Answer 41

Red green blue

Question 42

What are the secondary colours

Answer 42

Cyan magenta yellow

Question 43

Ciliary body

Answer 43

Connected to the lens. Muscles in the body allow the shape of the lens to change

Question 44

Chorid

Answer 44

Has a rich blood supply and nourishes the retina

Question 45

Fovea

Answer 45

Responsible for central vision