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Physics > Section 2 - Electromagnetic Spectrum and light > Flashcards

Section 2 - Electromagnetic Spectrum and light Flashcards

1
Q

What type of wave are Electromagnetic waves?

A

Transverse

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2
Q

What happens when you increase the frequency of an electromagnetic wave?

A

You increase the energy transferred

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3
Q

List the electromagnetic waves

A 
Radio Waves
Micro Waves
Infra Red
Visible Light
Ultra Violet
X-Rays
Gamma Rays
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4
Q

What does red and green light make?

A

Yellow light

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5
Q

What does red and blue light make?

A

Magenta

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6
Q

What does blue and green light make?

A

Cyan

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7
Q

What do filters do?

A

Let through some colours of light through, and absorb the others

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8
Q

What is black?

A

The absence of colour

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9
Q

What is white light?

A

All of the colours of light combined

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10
Q

How do we see light?

A

By light reflecting off the object and into our eyes. The object absorbs all of the light that is not the same colour as it.

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11
Q

Why do waves refract when changing medium?

A

Waves move at different speeds in materials with different densities, so when a wave changes medium it changes speed. When the wave hits the new medium at an angle, it causes a change in speed, this change of speed causes a change in direction.

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12
Q

What affects how much a wave refracts?

A

The shorter the wavelength the more it refracts

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13
Q

When a wave refracts and it slows down, which way does it bend?

A

Towards the normal

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14
Q

When a wave refracts and it speeds up, which way does it bend?

A

Away from the normal

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15
Q

What happens when a wave enters a new medium along the normal line?

A

It will change speed but will not refract

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16
Q

What is a converging lense?

A

A converging lense bulges in the middle. Causing parallel rays of light to converge on a principal focus

17
Q

What is a diverging lens?

A

A diverging lens caves outwards. It causes parallel rays of light to converge outwards.

19
Q

What is the focal length of a lens?

A

The distance between the centre of the lens and the principal focus

19
Q

What affects the focal length of a lens?

A

The more powerful the lens, the shorter the focal length. Because the lens is making the rays of light converge more.

20
Q

What is the principle focus of a converging lens?

A

Where the rays hitting the lens parallel to the axis all meet

21
Q

What is the principle focus of a diverging lens?

A

The point where rays hitting the lens parallel to the axis appear

22
Q

When is a real image formed by a lens?

A

When the light rays passing through the lens come together to form the image.

23
Q

When is a virtual image formed by a lens?

A

When the light passing through the lens creates an image that appears to be in a different place than the rays are coming from. (For example the image appears smaller that it should.)

Physics (11 decks)

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