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Yr 9 Revision > Light and EM Spectrum > Flashcards

Light and EM Spectrum Flashcards

1
Q

When a white light shines through a prism what colours does the white light split into?

A

Red, Orange, Yellow, Green, Blue, Indigo and violet.

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2
Q

When light enters a more dense medium which way does the light ray bend?

A

It bends towards the normal.

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3
Q

What is the normal?

A

A line which is 90 degrees to the mirror

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4
Q

Which colours are the primary colours of light?

A

Red, Blue and Green

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5
Q

Which rays have the smallest wavelengths?

A

Gamma Rays

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6
Q

Which rays have the biggest wavelengths?

A

Radio Rays

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7
Q

Which light is refracted the most?

A

Violet light

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8
Q

Which light is refracted the least?

A

Red light

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9
Q

Objects that give out light are called what?

A

Luminous

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10
Q

True or False?

“The angle of incidence is equal to the angle of reflection.”

A

True

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11
Q

When a white light ray is split into a spectrum of colours what is it called?

A

Dispersion

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12
Q

What does EM stand for?

A

Electro magnetic

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13
Q

Does light travel faster than sound?

A

Yes

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14
Q

Yellow light is a mixture of what?

A

Red light and Green light

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15
Q

What are the three secondary colours of light?

A

Magenta, Cyan and Yellow

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16
Q

What colour would a green leaf look under a red light?

A

Black

17
Q

True or False?

The speed of light is 300,000,000 metres per day

A

False

It is actually 300,000,000 metres per second

18
Q

If there is white light and a green ball, then a red filter is put between, what colour would the ball appear?

A

Black

19
Q

True or False?

All surfaces either scatter or reflect light

A

True

20
Q

Which waves can the human eye see?

A

Visible (light rays)

21
Q

Which waves does the sun give off?

A

Ultraviolet

22
Q

A yellow object would appear what colour under cyan light?

A

Green

23
Q

Why does red materials look red?

A

Red materials look red because they only reflect red light and absorb blue and green light

24
Q

When light passes from air into glass, the angle of incidence is always ________ than the angle of refraction.

A

Bigger

25
Q

Does mixing paints follow the same rule as mixing light?

A

No it doesn’t because they have different primary and secondary colours.

26
Q

A rocket was fired above a seaside town to call out the lifeboat crew. The rocket exploded, giving out light at the same time. Would someone nearby hear the bang first or see the flash?

A

See the flash first as light travels faster than sound.

27
Q

What is the light ray that hits the mirror called?

A

The incident ray

28
Q

What is the light ray that bounces off the mirror called?

A

The reflected ray

Yr 9 Revision (5 decks)

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