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Physics P2 > Electromagnetic Waves 1 > Flashcards

Electromagnetic Waves 1 Flashcards

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1
Q

What are electromagnetic waves?

A

Transverse waves that transfer energy

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2
Q

What is present in an electromagnetic wave?

A

An electric and magnetic field

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3
Q

At what speed do waves travel in a vacuum?

A

3x10*8 m/s

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4
Q

What is the relationship between frequency and wavelength?

A

Inversely proportional

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5
Q

What is a normal?

A

An imaginary line which is at right angles to a surface

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6
Q

When happens to all EM waves when they hit a mirror?

A

They are reflected at a boundary

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7
Q

What is the name for the angle where the incidinet happens and the angle for the reflection?

A

Angle of incidence=
=Angle of reflection (law of reflection)

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8
Q

What doe the fact of a wave being reflected or not depend on?

A

The wavelength

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9
Q

What is all that could happen when an EM wave travels from one medium into another?

A

Reflected
Absorbed
Transmitted

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10
Q

What is the amount of energy wave reflected, absorbed and transmitted dependent on?

A

The media (substances) which the wave is travelling through

The distance travelled by the wave

The wavelength of the wave

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11
Q

What does the colour of an object depend on?

A

On the amount by which different wavelengths of light are reflected and absorbed by its surfaces

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12
Q

What EM waves can pass straight through mirror?

A

X and gamma rays

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13
Q

What is refraction?

A

Change inirection of a wave as it travels from one medium into another

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14
Q

When does refraction happen?

A

When a wave changes speed upon travelling from the first medium into the second

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15
Q

What is the angle at which the wave refracts called?

A

Angle of refraction

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16
Q

What happens when a wave travels from air to glass, where does it refract and why?

A

Towards Normal, light travels more slowly in a glass than in air

17
Q

What is the name and measure of the angle when the wave hits the glass perpendicularly?

A

Normal incident, 0

18
Q

What is the process of refraction in water in deep water to shallow water?

A

Water waves travel slowly in shallow water

This causes them to refract towards the normal

It also decreases their wavelength

19
Q

What is the order of all EM waves from longest wavelength to shortest wavelength?

A

Radio waves - Real
Microwaves - Men
Infrared - I
Visible light - View
Ultraviolet - Use
X-rays - Xylophones
Gamma rays - Good

20
Q

What is the total angle at which waves are reflected?

A

90°

Physics P2 (20 decks)

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