Light And Sound

Question 1

How do we see things

Answer 1

Light is reflected into our eyes

Question 2

What part of the eye is used to bend and focus the light onto the retina

Answer 2

Lens

Question 3

What part of the eye is coloured and changes the size of the pupil

Answer 3

Iris

Question 4

What changes size depending on the amount of light

Answer 4

Pupil

Question 5

Where does light and an image form on the eye

Answer 5

Retina

Question 6

What sends the message from eye to brain

Answer 6

Optic nerve

Question 7

What is the clear part at front of eye called

Answer 7

Cornea

Question 8

What is refraction

Answer 8

Bending of light as it travels from one medium to another e.g. air to glass

Question 9

When light enters a glass block at an angle does it bend towards or away from the normal (90o) line and why

Answer 9

Bends towards normal
The light is slowed down as it enters the glass block

Question 10

What happens to light as passes through a convex lens

Answer 10

The light rays converge to a point (eg through lens in eye)

Question 11

What happens to light rays when pass through a convex lens

Answer 11

The light rays diverge (spread out)

Question 12

What is light dispersal

Answer 12

When light passes through a prism it splits into the different colours of light

Question 13

What are the colours of light

Answer 13

ROY G BIV
Red Orange Yellow. Green. Blue. Indigo. Violet

Question 14

Which colour of light bends the most and which bends the least

Answer 14

Violet light bends the most
Red light bends the least

Question 15

White light is part of the electromagnetic spectrum .
Name order of electromagnetic spectrum from shortest wave to longest wavelength

Answer 15

Gamma. X Ray. Ultraviolet white light. Infra red. Microwaves. Radio

Question 16

What are gamma rays used for and danger of it

Answer 16

Medicine - treat cancer
Can cause cancer

Question 17

What are x rays used for and dangers

Answer 17

Used to see bones
Danger - can cause cancer (dentist and nurses using it wear lead aprons for protection)

Question 18

What is ultraviolet light used for and dangers

Answer 18

Identifying forged notes, security identification
Sunbeds

Dangers - cause cancer

Question 19

What is infrared used for and dangers

Answer 19

Use - toasters, grills to cook food and heaters
IR beams to protect items - if beam broken alarm sounds
Night vision cameras

Dangers - can burn

Question 20

What are microwaves used for and dangers

Answer 20

Heat foods
Send signals to and from satellites
Mobile phone signals

Danger - an cause internal body heating

Question 21

What are radio waves used for

Answer 21

Transmitting radio and TV signals

Question 22

Light wave is an example of what type of wave

Answer 22

transverse wave

Question 23

The height of a wave is called?

Answer 23

Amplitude

Question 24

The bigger the amplitude (height of wave) the ———— the sound

Answer 24

Louder

Question 25

The distance between 2 waves is called the ?

Answer 25

Wavelength

Question 26

The closer the waves the —————- of sound

Answer 26

The higher the pitch of sound

Question 27

An example of longitudinal wave is

Answer 27

Sound

Question 28

What part of the ear vibrates when sound hits it

Answer 28

Ear drum

Question 29

What is the shell like part of ear called

Answer 29

Cochlea

Question 30

What makes the cochlea vibrate

Answer 30

The 3 small bones behind the ear drum

Question 31

How do signals reach brain

Answer 31

Auditory nerve

Question 32

What can sound not travel through

Answer 32

A vacuum

Question 33

What is the frequency of waves and how is it measured

Answer 33

Frequency is number of waves that pass a point in 1 second Measured in hertz [Hz]

Question 34

If there are 10 waves passing a point in 2 seconds what is h frequency

Answer 34

Frequency = 10 /2 = 5 Hz

Question 35

Pressure - how is it calculated

Answer 35

Pressure = Force (N)/ Area (cm2)

Question 36

,what are the units for pressure

Answer 36

N/m2 Or N/cm2 Look at the units given - force in N and are in cm2 or m2