Test 1 Y9 Flashcards

(43 cards)

1
Q

What is the function of the cornea

A

It controls how big your iris can get

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2
Q

What is the function of the iris

A

focus’ on what you can see

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3
Q

What is the function of the pupil

A

Like a hole that lets light into the lens and retina

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4
Q

What is the function of the lens

A

The lens is able to adjust to form a picture for us to see

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5
Q

What is the function of the retina

A

It contains 130 million light sensitive cells

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6
Q

What is the function of the optic nerve

A

It carries the signal from the eye to the brain

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7
Q

What happens when a ray of light enters a see through block at 90°

A

The light won’t change direction

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8
Q

What happens when a ray of light enters a see through block at any angle other than 90°

A

The light changes direction

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9
Q

What happens when light moves from air to glass

A

It slows down

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10
Q

What happens when light moves from glass to air

A

It speeds up

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11
Q

How do lenses work

A

Lenses work because their curved surface refracts the light and bends it

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12
Q

If both sides of a lens are pointed out what is it

A

A converging lens

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13
Q

If both sides of a lens are pointing in what is it

A

A diverging lens

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14
Q

When a light ray passes through a convex/ converging lens what happens

A

They crossover

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15
Q

When light passes through a diverging/concave lens what happens

A

They spread out

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16
Q

White light is split into the the colours of a rainbow through a prism what is this called

A

Dispersion

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17
Q

How does dispersion happen

A

The violet light slows down and the red light speeds up

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18
Q

What is the order of the em spectrum from high to low

A

Gamma
X-ray
UV
Visible
Infrared
Microwave
Radio

19
Q

What does em stand for

A

Electro magnetic

20
Q

What are the dangers and uses of gamma

A

They can pass through bones or teeth and cause cancer but also heals cancer

21
Q

What are the dangers and uses of X-ray

A

They can cause blocked blood vessels and bone cancer but are very useful in hospitals to check for Brocken bones and pregnancy

22
Q

What are the dangers and uses of uv

A

These can cause skin cancer and sunburn

23
Q

What are the dangers and uses of visible light

A

It helps us see our surroundings but can cause sunburn if excessive

24
Q

What are the dangers and uses of infrared

A

IR is used for cooking and remote controls but can cause damage to the skin

25
What are the dangers and uses of microwave
Heating foods but can cause skin burn
26
What are the dangers and uses of radio
They are used for communication and broad casting
27
What is in the outer ear
Pinna, ear canal and ear drum
28
What is the function of the outer ear
It collects and funnels sound waves
29
What are the 3 small bones in the ear called
The hammer, stirrup and anvil
30
What is the function of the middle ear
It amplifies sound
31
What is the function of the inner ear
The inner ear simply helps you hear better
32
Can air travel through vacuum
No
33
What is the equation for speed
Speed= distance/time
34
What is the equation for time
Time = speed/distance
35
What is the equation for distance
Distance = time x speed
36
What is frequency measured in
Hertz
37
Pressure = ?
Force/area
38
What are the units for pressure
N/cm2 and n/m2
39
What is conduction
The transfer of heat through solids
40
What is convection
When heat is transferred through gas and water
41
What is radiation
the matter that is emitted in the form of electromagnetic waves
42
How is background radiation caused
It is caused by radioactive materials found mostly rocks and soil
43
What are three 3 types of radiation in order of radioactivity
Alpha (least) Beta Gamma (most)