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T3 > Science > Flashcards

Science Flashcards

1
Q

What’s the formula for pressure?

A

P = f / a

f = force a=unit area

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2
Q

What is the unit for pressure?

A

Pascals

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3
Q

What is the formula for a right triangle?

A

AB / 2

A = height b= base

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4
Q

What are light sources referred to as?

A

They are reffered to as luminous.

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5
Q

What are the three ways light can affect objects?

A

It can be transmitted, reflected or absorbed.

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6
Q

What happens when an object absorbs light?

A

It is converted into thermal energy and heats the object up.

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7
Q

Does light need a medium?

A

No

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8
Q

What happens to light that is far away?

A

It spreads out and thus gets dimmer.

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9
Q

What is the initial ray of light called in a reflection?

A

Incident ray

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10
Q

What is another name for a flat mirror

A

A plane mirror

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11
Q

What are the two types of images?

A

Virtual and real

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12
Q

What is a real image?

A

Its an image you don’t need to look through anything to see.

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13
Q

What is the law of reflection?

A

It states that angle of incidence = angle of reflection

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14
Q

What is a laterally inverted image?

A

Its an image that is flipped to be opposite of the object.

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15
Q

What is refraction?

A

It is the bending of light

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16
Q

How do you calculate angle of refraction?

A

Same as reflection but on the other side of the material.

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17
Q

Do refracted objects appear higher or lower than they are?

A

Higher

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18
Q

What does the speed in different materials depend on?

A

It depends on the density of the material.

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19
Q

How do you calculate the refractive index?

A

Speed of light in a vacuum / speed of light in the medium

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20
Q

How many times does light refract in an object?

A

2 times

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21
Q

What are the colours of the white light spectrum?

A

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

22
Q

What is the process of splitting white light into a spectrum called?

A

Dispersion

23
Q

Why can you only see a rainbow when the sun is behind you?

A

Light reflects backwards off of raindrops so can only be seen behind.

24
Q

How can you recombine the light spectrum?

A

By using another prism upside down.

25
Q

What are the three primary colours?

A

Red, green and blue

26
Q

How do televison coloured screens work?

A

They work by emitting primary colours and placing a filter over them.

27
Q

What happens to the image formed on the retina?

A

It is upside down

28
Q

Why would an object look red?

A

It’s because the object absorbed all other forms of light except red which it reflects.

29
Q

Is light a wave or a particle?

A

Wave-particle

30
Q

What transfers signals from your eye to your brain?

A

The optic nerve

31
Q

Where is the retina?

A

At the back of the eye

32
Q

What is the muscle that controls the size of the pupil called?

A

The iris

33
Q

What is the hole light goes in called?

A

The pupil

34
Q

What is the transparent outer layer of the eye called?

A

The cornea

35
Q

What part of the eye focuses light on the retina?

besides the cornea

A

The lens

36
Q

What is the critical angle in refraction?

A

It’s the angle where refracted light is at 90 degrees to the normal

37
Q

What is internal reflection?

A

It’s when the refracted angle exceeds the critical angle

38
Q

What is the name of the effect which allows raindrops to cause a rainbow?

A

Dispersion

39
Q

What is a regular reflection?

A

It’s when light reflects off of a smooth surface.

40
Q

Does a blue filter absorb or let blue pass through?

A

It lets blue pass through and absorbs everything else.

41
Q

What happens if you remove a magnet from steel after putting it near one?

A

The steel remains magnetized.

42
Q

How can you demagnetize an object?

A

By heating it up or hitting it with a hammer

43
Q

How could you see a magnet?

A

By using a plotting compass or iron filings

44
Q

What is an electromagnet?

A

It’s a magnet that is powered by electricity.

45
Q

What can make an electromagnet stronger?

A

Coils

46
Q

What influences the strength of an electromagnet?

A
  • The number of turns of the coil
  • The voltage
  • The type of core (magnetic materials are better)
47
Q

What is the advantage of an electromagnet over regular magnets?

A

You can turn it on and off

48
Q

What are relays?

A

They’re a device to use current in one circuit to power another circuit.

usually when it’s too dangerous to handle normally

49
Q

What are some uses of electromagnets?

A

Relays, fire doors, electric bells and MRI machines

50
Q

What is the difference between primary and secondary energy sources?

A

Primary comes from nature while secondary comes from refined primaries.

51
Q

What will happen if you move a magnet towards a voltmeter?

A

It will induce a voltage.

52
Q

What will happen if you move a South magnet towards a voltmeter instead of North?

A

The direction of movement for the coil will be reversed.

T3 (7 decks)

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