Topic 6 Electromagnetic Waves And Refractiom Flashcards

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1
Q

What are all EMwaves

A

Transverse waves transfer energy from a source to an absorber

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2
Q

What do all EM waves travel at

A

The same speed through air or a vacuum

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3
Q

What are the electromagnetic waves form

A

A continuous spectrum of a range of frequencies

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4
Q

Order of electromagnetic waves in increasing frequency as you go down and decreasing wavelength

A

Radio waves
microwaves
infrared
visible light
ultraviolet
x-rays
gamma rays

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5
Q

Radio waves

A

Lowest frequency
Highest wave length

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6
Q

Gamma rays

A

Highest frequency
Lowest wave length

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7
Q

Why is there such a large range of frequencies

A

Because they are generated by a variety of changes in atoms and the nuclei

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8
Q

Why are EN waves different purposes 

A

Because they have different properties

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9
Q

What happens when a wave causes the boundary between a material at an angle

A

It changes direction and is refracted

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10
Q

What does how much are waves refract By depend on

A

How much the wave speed up or slow down which usually depends on the density of a two

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11
Q

What happens if A materials has a higher density

A

The slower a wave travels through it

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12
Q

What happens if a wave crosses the boundary in slows down

A

It will bend towards the normal

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13
Q

What happens if a material crosses as a boundary and speed up

A

It speeds up and will be bend away

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14
Q

What changes when a wave is refactod

A

The wavelength

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15
Q

What stays the same when a wave is refracted

A

The frequency

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16
Q

What happens if a wave is travelling along the normal

A

It will change speed but it will not be refracted

17
Q

What is the optical density of a material

A

The measure of how quickly like in travel through it
the higher optical density the slower light waves travel through it

18
Q

What is the angle between the ray and the normal

A

The angle of incidence

19
Q

What happens if the material is more optically dense

A

The angle of refraction (angle between refracted ray and normal) is smaller than the angle of incidence