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Physics > Test 1 Y9 > Flashcards

Test 1 Y9 Flashcards

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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
Q

What are the dangers and uses of microwave

A

Heating foods but can cause skin burn

26
Q

What are the dangers and uses of radio

A

They are used for communication and broad casting

27
Q

What is in the outer ear

A

Pinna, ear canal and ear drum

28
Q

What is the function of the outer ear

A

It collects and funnels sound waves

29
Q

What are the 3 small bones in the ear called

A

The hammer, stirrup and anvil

30
Q

What is the function of the middle ear

A

It amplifies sound

31
Q

What is the function of the inner ear

A

The inner ear simply helps you hear better

32
Q

Can air travel through vacuum

A

No

33
Q

What is the equation for speed

A

Speed= distance/time

34
Q

What is the equation for time

A

Time = speed/distance

35
Q

What is the equation for distance

A

Distance = time x speed

36
Q

What is frequency measured in

A

Hertz

37
Q

Pressure = ?

A

Force/area

38
Q

What are the units for pressure

A

N/cm2 and n/m2

39
Q

What is conduction

A

The transfer of heat through solids

40
Q

What is convection

A

When heat is transferred through gas and water

41
Q

What is radiation

A

the matter that is emitted in the form of electromagnetic waves

42
Q

How is background radiation caused

A

It is caused by radioactive materials found mostly rocks and soil

43
Q

What are three 3 types of radiation in order of radioactivity

A

Alpha (least)
Beta
Gamma (most)

Physics (3 decks)

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