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Physics > Electromagnetic Spectrum > Flashcards

Electromagnetic Spectrum Flashcards

1
Q

What is wavelength?

A

The length of a full cycle

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2
Q

What is amplitude?

A

Distance between the rest position and crest

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3
Q

What is frequency?

A

Number of complete waves per second

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4
Q

What is the unit for frequency?

A

Hz

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5
Q

Give an example of a transverse wave

A

Light and all other electromagnetic waves

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6
Q

What is a longitudinal wave?

A

Vibrations along the same line

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7
Q

Give an example of a longitudinal wave

A

Sound waves

Ultrasound

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8
Q

Give two properties of all electromagnetic waves

A 
Transverse 
Same speed (through air)
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9
Q

What is the equation for wave speed?

A

Speed = frequency x wavelength

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10
Q

What is the unit for speed?

A

M/s

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11
Q

What is the unit for wavelength?

A

M

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12
Q

What is the rule for reflection?

A

Angle of incidence = angle of reflection

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13
Q

What is refraction?

A

Ray goes through a material and changes direction

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14
Q

What is diffraction?

A

All waves diffract at the edges when passing through a gap or an obstacle

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15
Q

What happens hen a wave goes through a gap much wider than it’s wavelength?

A

Little diffraction

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16
Q

What happens when a wave goes through a gap a little bit wider than wavelength?

A

Diffraction only at edges

17
Q

What happens when waves go through a gap the same as wavelength?

A

Maximum diffraction

18
Q

When do waves refract?

A

When they meet a new medium at an angle

19
Q

Electromagnetic spectrum (longest to smallest wavelength)

A 
Radio waves
Microwaves
Infrared
Visible light 
Ultraviolet
X-rays
Gamma rays
20
Q

What is the main use of radio waves?

A

Communication

21
Q

What are satellite waves used for?

A

Satellite communication

Mobile phones

22
Q

What are infrared waves used for?

A

Remote controls

Optical fibres

23
Q

What are visible light waves useful for?

A

Photography

24
Q

What is the shortest wavelength?

A

Gamma rays

10^-15m

25
Q

What is the longest wavelength?

A

Radio waves

10^4m

26
Q

What is the link between frequency and wavelength for electromagnetic waves?

A

Higher frequency

Shorter wavelength

27
Q

How does frequency affect he pitch of a sound wave?

A

Higher frequency = high pitch

Low frequency = low pitch

28
Q

What is frequency for sound waves?

A

Number of complete vibrations each second

100Hz = 100 vibrations per second

29
Q

What effect does the amplitude have on a sound wave?

A

Bigger amplitude

Louder sound

30
Q

What is an ionosphere?

A

An electrically charged layer in the Earths upper atmosphere

Physics (1 decks)

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