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frube Physics 2 > P12- Electromagnetic Waves > Flashcards

P12- Electromagnetic Waves Flashcards

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1
Q

What type of wave are electromagnetic waves?

A

Transverse

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2
Q

Why are em waves not mechanical?

A

They can travel through a vacuum

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3
Q

What do elm waves transfer?

A

Energy

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4
Q

What is the em spectrum, from highest to lowest wavelength

A

Radio, microwave, infrared, visible light, uv, x rays, gamma

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5
Q

How are em waves produced?

A

Changes in an atom

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6
Q

How are gamma rays produced?

A

Changes in the nucleus of an atom

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7
Q

How are radio waves produced?

A

Oscillations in an electrical circuit

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8
Q

How are radio waves detected?

A

Waves are absorbed and create an alternating current with the same frequency as the radio wave

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9
Q

What are radio waves used for?

A

Transmitting tv, radio and, mobile phones and Bluetooth

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10
Q

Why are radio waves used?

A

Cam travel long distances through air
Longer wavelengths can bend around obstacles and can be detected without being in the line of sight

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11
Q

What are microwaves used for?

A

Satellite communications and cooking food

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12
Q

Why are microwaves used?

A

Can pass through the atmosphere
Can penetrate into food

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13
Q

What are the hazards of micro waves and radio waves?

A

Can penetrate the body and can cause internal damage

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14
Q

What are infrared waves used for?

A

Electrical heaters, cooking food and infrared cameras

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15
Q

Why are infrared waves used?

A

Transfer energy quickly to heat rooms and food
Sensors can detect the infrared waves to turn them into images as all hot objects emit infrared radiation

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16
Q

What are the dangers of infrared radiation?

A

Can damage or kill skin cells

17
Q

What is visible light used for?

A

Fibre optic cables

18
Q

Why is visible light used?

A

Short wavelength means it can transfer information
Can bend around corners

19
Q

What are the risks of visible light?

A

Can cause eye damage

20
Q

What are the uses of UV?

A

Artificial tanning
Energy efficient lights

21
Q

Why is UV used?

A

Carries more energy than visible light

22
Q

What are the dangers of UV?

A

Can damage skin cells, risk of cancer, blindness

23
Q

What are x rays and gamma rays used for?

A

Medical imaging and treatments

24
Q

Why are x rays and gamma rays used?

A

Pass easily through flesh, but not denser materials such as bone

Can be used to kill cancer cells as high doses kill cells
Gamma used to kill bacteria

25
Q

What are the dangers of using gamma and x rays

A

Form ionising radiation, which can damage cells and cause cancer

26
Q

What is refraction?

A

Waves change speed and direction as they cross a boundary from one substance to another due to a change in velocity

frube Physics 2 (6 decks)

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