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CGP KS3 Physics > Waves > Flashcards

Waves Flashcards

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1
Q

LIGHT WAVES:

What is light produced by?

A

Luminous objects such as flames, light bulbs and then sun.

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2
Q

An object that produces light is called a?

A

Light source.

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3
Q

Light is a ____ which always travels in a _________ ____

A
  1. Wave 2. straight line
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4
Q

Light waves are ________ - they have ___________ at ______ ______ to the direction the wave is travelling in.

A
  1. transverse waves 2.undulations 3. right angles
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5
Q

Light waves ________ ______ from one place to another

A

Transfer energy

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6
Q

Light waves can be ______ too. This is how mirrors work.

A

Reflected

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7
Q

Some waves need a _____ to travel through. This substance is called a ______.

A
  1. Substance 2. Medium
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8
Q

Water waves are like this- they travel by moving _____ (the water molecules) around. Water is the _____ that a water wave travels through.

A
  1. Particles 2. medium
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9
Q

Unlike water waves, light waves don’t need ______ to travel.

A

Particles

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10
Q

Light from the ___ has to travel through ____ to reach ____

A
  1. Sun 2. space 3. Earth
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11
Q

Light waves are _____ ____ by particles.

A

Slowed down

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12
Q

Light travels _____ when there aren’t many particles to get in the way.

A

Faster

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13
Q

Light always travels fastest in a _____. A _____ is where there is nothing at all - no air, no particles, nothing. Space is mostly a ______.

A

1,2,3 Vacuum

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14
Q

The speed of light in a vacuum is?

A

3x10⁸ m/s (That’s three hundred million metres per second.)

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15
Q

This means light from the Sun gets to Earth in just _____ - even though its 150,000,000 km away

A

8.3 minutes

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16
Q

The speed of light in a vacuum is a _____. That means it’s always the ____, no matter what colour the light is.

A
  1. Constant 2.same
17
Q

Nothing travels _____ than light in a vacuum.

A

Faster

18
Q

The speed of light waves in a vacuum=

A

3x10⁸ m/s

19
Q

Light will travel _____ than this when it has to go through a _____ (like air or water)

A
  1. Slower 2. Medium
20
Q

SOUND WAVES:

It’s your ___ _____ that detects any sound that enter your

A

Ear drums.

21
Q

WATER WAVES:
A transverse wave has ____________ ( __ and ____ movements) that are at _____ ______ to the _________ the wave is travelling in.

A
  1. Undulations 2. Up and down 3. right angles 4. direction
22
Q

Waves ________ ______ from one place to another.

A

Transfer energy

23
Q

The undulations are also at right angles to the direction of ______ ________.

A

Energy transfer.

24
Q

Lots of other important waves are __________ too, like _____ waves.

A
  1. Transverse 2. Light
25
Q

If a water wave hits a surface, it will be _________.

A

Reflected

26
Q

This causes the _________ of the wave to change.

A

Direction

27
Q

___ ______ can be reflected.

A

All waves

28
Q

The _____ is the highest part of the wave

A

Crest

29
Q

The ______ is the lowest part of the wave.

A

Trough

30
Q

The ___________ is how ___ a point on the wave is from the ______ line.

A
  1. Displacement 2. far 3. middle
31
Q

The _________ is the maximum ____________ - the distance from the middle of the wave to a crest or trough.

A
  1. Amplitude 2. Displacement
32
Q

Superposition happens when ___ waves meet.

A

Two

33
Q

If two water waves meet, their displacements will _______ briefly.

A

Combine

34
Q

This means that they become one single ____, with a ____________ that’s equal to the displacement of each individual wave added together.

A
  1. Wave 2. Displacement
35
Q

This is called _____________.

A

Superpostion

36
Q

After combining, the waves then carry on as they were ______.

A

Before

CGP KS3 Physics (5 decks)

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