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Physics 2: waves > L5: electromagnetic spectrum > Flashcards

L5: electromagnetic spectrum Flashcards

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1
Q

What types of radiation does the sun give?

A

Infrared (below red), light and ultraviolet

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2
Q

Which type of wave is light?

A

Transverse

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3
Q

What is light?

A

It is an electromagnetic wave and particle

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4
Q

What is the relation between freq and wavelength?

A

Long wavelength, small freq

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5
Q

What waves are on the electromagnetic spectrum (longer wavelengths to shorter)?

A

Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma

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6
Q

Where is visible light on the electromagnetic spectrum?

A

In the middle, it is a small part of the spectrum

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7
Q

Can you name three properties of EM waves?

A

Transverse waves, they travel at the speed of light (3x100000000 m/s), can travel through a vacuum

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8
Q

What is the unit of freq?

A

Hz

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9
Q

What does UV stand for?

A

Ultraviolet

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10
Q

What is the range of visible light?

A

From 400nm(violet) to 700nm (red)

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11
Q

What EM radiation has shorter wavelengths than violet?

A

Ultraviolet

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12
Q

What EM radiation has longer wavelengths than red?

A

Infrared

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13
Q

What is infrared radiation?

A

A type of heat

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14
Q

As the temp of the object increases, what happens to the intensity of the infrared radiation given off by the object?

A

The amount of infrared radiation given off increases. As it gets hotter, visible light is also emitted (e.g. red hot object)

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15
Q

Name three uses of infrared radiation?

A

In night-vision cameras, heaters and TV remote controls

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16
Q

What effect does infrared radiation have on us?

A

It heats us up

17
Q

Can you name a use of radio waves?

A

Used to transmit radio and TV programmes (TV uses higher
frequencies)

18
Q

Can you name a property of radio waves?

A

Can bend round hills and also reflect off upper atmosphere and so
able to travel long distances

19
Q

What are microwaves the correct freq for?

A

To cause water molecules to vibrate, so they are used to heat food

20
Q

Other than heating food, what are microwaves used for?

A

Communication (e.g. mobile phones)

21
Q

What colours is visible light made of?

A

The rainbow (7 colours)

22
Q
A

Physics 2: waves (6 decks)

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