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Physics > Electromagnetic Spectrum, Waves > Flashcards

Electromagnetic Spectrum, Waves Flashcards

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1
Q

Electromagnetic waves all travel at the same…….in free space

A

Speed

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2
Q

What speed do traverse waves travel at

A

Speed of light

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3
Q

What can electromagnetic waves travel through

A

a vacuum

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4
Q

Electromagnetic waves have different…….and………

A

Wave lengths and frequencies

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5
Q

Give the order for the electromagnetic spectrum

A 
Radio waves
Microwaves
Infrared Radiation
Visible light
Ultra-violet
Xrays
Gamma rays
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6
Q

What does the electromagnetic spectrum go up in decreasing….

A

Wave lengths

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7
Q

Give a use for Radio waves

A

broadcasting and telecommunications

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8
Q

Give a use for microwaves

A

longitudinal and satellite transmission

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9
Q

Give a use for Visible light

A

Optical fibres and daylight

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10
Q

Give a use for Ultra violet light

A

Hidden messages, crime prevention

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11
Q

Give a use for X rays

A

Observing the internal structures of objects and materials

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12
Q

Give a use for Gamma rays

A

sterilising food and hospital equipment

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13
Q

Give a danger for Microwaves

A

Internal heating of body tissue

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14
Q

Give a danger for Infra-red radiation

A

Skin burns

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15
Q

Give a danger for Ultra violet light

A

Damage to surface skin cells, (cancer), and blindness

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16
Q

Give a danger for Gamma rays

A

Cancer, genetic mutation

17
Q

In traverse waves each point of the wave is moving …….to the direction in which the ….. of the wave is moving

A

Perpendicular

Energy

18
Q

Give a transverse wave that is not part of the electromagnetic spectrum

A

Mexican waves

19
Q

In longitudinal waves the energy travels….. to the direction of travel

A

Parallel

20
Q

Give the relationship between speed, frequency and wave length of a wave.

A

Speed = Wavelength x Frequency

21
Q

Give the relationship between frequency and time of a wave.

A

Frequency = 1 ÷ time

22
Q

Give an example of a longitudinal wave

A

Sound waves

23
Q

What is frequency measured in

A

Hertz (KHz)

24
Q

Define Frequency

A

The number of waves per second

25
Q

Define the time period

A

The time it takes one complete wave to pass, (in seconds)

26
Q

What are the areas called in a longitudinal wave where the waves are most spread out

A

Rarefactions

Physics (23 decks)

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