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GCSE Physics Revision > P6 - Waves > Flashcards

P6 - Waves Flashcards

1
Q

What is a transverse wave?

A

Vibrate perpendicular to direction of energy transfer

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2
Q

What is longitudinal wave

A

Vibrate parallel to direction of energy transfer

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3
Q

What direction do magnetic fields go?

A

North to south

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4
Q

Example of transverse wave

A

Light wave

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5
Q

Example of longitudinal wave

A

Sound

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6
Q

What is the stationary point of two oscillating waves called?

A

A node

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7
Q

Amplitude is distance from ___ to what

A

Crest/trough to line of equilibrium (NOT full height)

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8
Q

What is frequency

A

Number of waves passing a point each second

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9
Q

When lines a spread apart in a longitudinal wave what is this called?

A

Rarefaction

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10
Q

When waves are close together in a longitudinal wave what is this called?

A

Compression

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11
Q

Wavelength varies ____ and amplitude varies ___ (in terms of sound)

A

Pitch
Volume

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12
Q

What is the time period of a wave

A

Time taken for a complete oscillation

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13
Q

Give a an equation linking frequency and time period

A

f = 1/T (capital T)

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14
Q

We measure frequency in ___

A

Hz (Hertz)

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15
Q

Give an equation linking velocity of the wave, wavelength and time period

A

V = lambda / Time period
V = wavelength / time period

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16
Q

What is the wave equation?

A

V = f x lambda

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17
Q

How fast does light travel in a vacuum?

A

3 x 10 o the power 8 m/s

18
Q

In what material does light move slowest

A

Diamond

19
Q

Describe refraction

A

As light slows down and enters a denser material it bends towards the normal
(Sometimes describe the car?)
As light speeds up after leaving the material it bends away from the normal

20
Q

Always draw:

A

Incident ray
Refracted ray
Normal

21
Q

When drawing a diagram with an incident ray, refracted ray, and then one out the other side what happens?

A

The refracted ray is also now an incident ray for light going from the glass to the air
The ray coming out is hence refracted

22
Q

What are EM waves?

A

Energy waves

23
Q

Transverse can travel through a ___ but longitudinal can’t

A

Vacuum

24
Q

Give a nemonic for the EM spectrum

A

Rude men in vans usually exit Greenwhich

25
Q

Give the EM spectrum

A

Radio
Microwaves
Infrared
Visible
Ultraviolet
X rays
Gamma rays

26
Q

Radio has high or low wavelength

A

High

27
Q

Microwaves have a high/low wavelength

A

High

28
Q

Microwaves can travel in ____ lines better than radio waves as they have higher ____

A

Straight
Energy

29
Q

What type of radiation is infrared?

A

Heat

30
Q

Infrared can be used for communication true or false

A

True

31
Q

How is visible light produced?

A

Electrons fall from higher to lower energy states

32
Q

Visible light is used in ___ ____ cables

A

Fibre optic

33
Q

UV can be used for energy ___ lights

A

Efficient
(Fluorescence)

34
Q

What is x ray used for

A

Detecting dense things

35
Q

What is gamma radiation used for

A

Medicine
Nuclear bombs
Killing harmful bacteria, sterilising surgical equipment, killing cancer cells

36
Q

UV light can be used to sterilise ___ and kill ____ and detect ___

A

Water
Bacteria
Forgery

37
Q

Infrared radiation is for __- distance communication

A

Short

38
Q

How can infrared radiation be used in medicine

A

Detect cancerous tumours which give off more heat than other parts of the body

39
Q

Give 3 methods of energy transfer

A

Convection conduction and radiation

40
Q

Infrared is emitted by ___ stuff and __ stuff

A

Hot and large

41
Q

If an object is cooler than surroundings it ___ more IR radiation until it reaches same temperature

A

Absorbs

GCSE Physics Revision (5 decks)

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