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Physics year 9 > Waves > Flashcards

Waves Flashcards

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0
Q

Name two types of wave.

A

Transverse and longitudinal.

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1
Q

What do waves transfer?

A

Energy but not matter.

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2
Q

What is the direction of oscillation in a transverse wave?

A

Perpendicular to the direction of energy transfer.

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3
Q

What is the direction of oscillation in a longitudinal wave?

A

Parallel to the the direction of energy transfer.

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4
Q

Can electromagnetic waves travel through a vacuum?

A

Yes.

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5
Q

What is the amplitude?

A

It is the maximum distance from the mean position.

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6
Q

What is the wavelength?

A

It is the distance for one complete oscillation.

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7
Q

What is the frequency?

A

It is the number of complete oscillations per second.

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8
Q

What is a ray?

A

A line drawn at right angles to the wavefront which shows which way the wave is travelling.

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9
Q

Wave equation:

A

Wave speed = frequency x wavelength

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10
Q

Another wave equation:

A

Frequency = wave speed / wavelength

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11
Q

Can all waves be reflected?

A

Yes.

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12
Q

What is the Law of Reflection?

A

The angle of incidence is equal to the angle of reflection.

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13
Q

What is the normal?

A

An imaginary line at 90 degrees to the surface.

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14
Q

What is constructive interference?

A

When crest meets crest creating a bigger wave.

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15
Q

What is destructive interference?

A

When a crest meets a trough and they cancel each other.

16
Q

Describe the image in a plane mirror.

A

Upright
The same size as the object
Virtual (rays if light do not touch the image)
Laterally inverted (left and right are swapped)

17
Q

What happens when light go into a less dense medium?

A

It speeds up.

18
Q

What happens when light goes into a more dense medium?

A

It slows down.

19
Q

What happens if the direction of travel of the light is not along the normal?

A

It bends - refracts.

20
Q

What is diffraction?

A

It is when a wave passes a barrier or goes through it and spreads out.

21
Q

What happens to the wavelength and frequency when a wave diffracts?

A

They stay the same - only the edges spread out.

22
Q

What waves diffract more: longer or shorter waves?

A

Longer waves diffract more than shorter waves.

Physics year 9 (7 decks)

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