Optics

Question 1

How do you see colours

Answer 1

White light hits an object, all the colours are absorbed except Defoe the colour you see it reflects

Question 2

How does light travel

Answer 2

Straight line

Question 3

What is light

Answer 3

Form of energy that can be detected by the human eye.

Question 4

What is visible light

Answer 4

A mixture of all the colours of the rainbow

Question 5

What do colours have different amounts of

Answer 5

Energy

Question 6

How can light be understood

Answer 6

Using wave model

Question 7

Who was the first person to measure speed of light. What is it

Answer 7

Albert Michelson.

1000000000 km/h

Question 8

What does light and sound travel in

Answer 8

Waves

Question 9

What is lightning

Answer 9

Burst of electrons come out of a cloud

Question 10

How do you calculate how far away lighting is

Answer 10

Multiply seconds between strikes in a row by speed of the sound

Question 11

How long does light take to reach us from space

Answer 11

Thousands of years. Sometimes by the time we see it it’s already dead

Question 12

What are some technology we use that use light

Answer 12

Microscope, telescope, periscope,binoculars, fibre optics, camera

Question 13

What colours does white light contain

Answer 13

All

Question 14

What on the skin of a fruit reflects colours

Answer 14

Chemicals

Question 15

What are lasers

Answer 15

Beams of very intense light

Question 16

Why are there colours in soap bubbles

Answer 16

Colour waves bumping into each other

Question 17

Why is the sky blue

Answer 17

Air particles scatter the sun light, there are more blue ones so we see blue

Question 18

What are the differences with white and black

Answer 18

White: reflect all colours
Black: absorb all colours

Question 19

What sort of waves and frequency does red light have

Answer 19

Long slow waves, low frequency, low energy

Question 20

What sort of waves and frequency does blue light have

Answer 20

Short fast waves, high frequency, high energy

Question 21

How many colours are lasers

Answer 21

Only one colour so you can’t break it

Question 22

What happens when a laser is shown through a prism

Answer 22

It refracts but does not disperse

Question 23

What do wave models explain

Answer 23

That light is a type of wave that travels through empty space, and transfers energy from one place to another.

Question 24

What are the parts of a wave called

Answer 24

Peak, troph, wavelength

Question 25

What is frequency

Answer 25

The number of repetitive motions that pass a point,

Question 26

What happens with the larger the amplitude

Answer 26

Greater energy

Question 27

What is a wave length

Answer 27

Distance from peak to peak or trouph to trouph

Question 28

What do longer wavelengths do

Answer 28

They refract the least

Question 29

What do short wavelengths mean

Answer 29

High frequency

Question 30

What do high wave lengths mean

Answer 30

Low frequency

Question 31

What are the properties of visible light

Answer 31

``` Light travels in a straight line Light reflects Light refracts Light disperses Light travels through a vacuum Light travels through objects to different degrees ```

Question 32

What is refracting

Answer 32

When light travels through a substance and bends then continues in a straight line

Question 33

What is visible light spectrum

Answer 33

Can be seen due to dispersion of light through a prism

Question 34

What are the constituent colours of white light

Answer 34

Red, yellow, orange, green, blue, indigo, violet

Question 35

What colour has smallest refraction

Answer 35

Red

Question 36

What colour has the largest refraction

Answer 36

Violet

Question 37

Types of electro magnetic radiation

Answer 37

``` Radio waves Microwaves Infrared Ultra violet X rays Gamma rays ```

Question 38

Radio waves

Answer 38

Lowest energy and frequency Pros improved tele communication Cons uncertain of long term affects

Question 39

Microwave

Answer 39

Highest frequency for radio waves

Question 40

Infrared

Answer 40

Lower energy and frequency

Question 41

Ultra violet

Answer 41

High frequency and energy Pros treats jaundice in babies Cons skin cancer

Question 42

X Rays

Answer 42

Higher frequency than UV Pros medical detection Cons over exposed can cause cancer

Question 43

Gamma rays

Answer 43

Have highest frequency and shortest wave length

Question 44

What can happen when light hits something

Answer 44

Can be reflected bent or absorbed

Question 45

What lights control tvs

Answer 45

Infrared

Question 46

What does the way light is curved affect

Answer 46

How it bends

Question 47

What angle does light reflect

Answer 47

The angle it was hit with

Question 48

Concave

Answer 48

Image will be upside down | Will diverge light

Question 49

Convex

Answer 49

Magnifying | Focusing

Question 50

What happens when light is absorbed

Answer 50

Turns to heat

Question 51

What are the 2 cells in the retina

Answer 51

Cones : colour | Rods: black / night

Question 52

What are the 3 different visibility rates

Answer 52

Opaque can't see through Translucent cloudy Transparent clear

Question 53

Virtual image

Answer 53

When you can focus on something on a concave lens but not on a screen.

Question 54

How do eyes see stuff

Answer 54

Light reflects of of an object into our eyes, through the lens where it turns upside down, then to the retina where it turns right side up, then to the optic nerve to the brain