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Y11 GCSE Physics > Waves > Flashcards

Waves Flashcards

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1
Q

Define wavelength

A

Distance from one peak to the next

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2
Q

Frequency

A

(F)
How many complete waves there are per second
Measured in hertz (Hz)
1Hz is 1 wave per second

F = 1/t

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3
Q

Frequency and time equation

A

F = 1 /t

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4
Q

Amplitude

A

Height of the wave (from rest to crest)

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5
Q

Speed (waves)

A

(v, for velocity)

How fast the wave goes

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6
Q

Period

A 
(T)
Time takes (s) for one complete wave to pass a point
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7
Q

Diagram showing labelled wave

A
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8
Q

Formula

Wave speed
Frequency
Wavelength

A

Speed (m/s) = frequency (Hz) x wavelength (m)

V = f x wavelength

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9
Q

Describe transverse wave

A
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10
Q

Describe longitudinal wave

A
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11
Q

Wave and matter statement

A

Waves transfer energy and information without transferring matter

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12
Q

Describe Doppler effect

A

If a wave source is moving towards an observe the frequency of the wave they observe will be higher and the wavelength will be shorter than the original wave emitted by source

Wave source is moving away from observer, the frequency of the wave they observe will be lower the wavelength will be longer than the original wave emitter by the source

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13
Q

Electromagnetic spectrum

Names in order smallest frequency to largest

A
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14
Q

Radio waves uses

A

Communications

  • transmitted a long way
  • TV and radio broadcasting
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15
Q

Microwaves used

A

Satellite communications and cooking

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16
Q

Infra-red radiation use

A

Heating and to monitor temperature

Warm / heat food
Night vision equipment

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17
Q

Light signals uses

A

Travel through optical fibres

Communication

Telephone and broadband internet cables

Medical (see inside the body)

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18
Q

Visible light uses

A

Photography

Cameras

19
Q

Ultraviolet uses

A

Fluorescent lamps

20
Q

X Rays uses

A

See inside things

21
Q

Gamma radiation uses

A

Sterilising medical equipment (kills microbes)

```
Sterilising food
Fresh longer, not radioactive after so still safe to eat
~~~

22
Q

EM radiation can be

Why

A

Harmful (some)

  • some passes through soft tissue without being absorbed (radio waves)
  • others are absorbed and cause heating of cells (microwaves)
  • some can cause cancerous changes in living cells (gamma rays)
23
Q

The higher the frequency the more … waves are

A

Dangerous

24
Q

Diffuse reflection

A

When light reflects from an uneven surface such as a piece of paper the light reflects off at all different angles

25
Q

Clear reflection

A

When light reflects from even surface then it’s all reflected at the same angle

26
Q

Law of reflection

A

Angle of incidence = angle of reflection

27
Q

Normal

A

Imaginary line that’s perpendicular (at right angles) to the surface at the point of incidence (the point where the wave hits the boundary) the normal is usually shown as a dotted line

28
Q

Angle of incidence

A

Angle between the incoming wave and the normal

Angle of reflection is the angle between the reflected wave and the normal

29
Q

Reflection wave diagram

A
30
Q

Wave refraction diagrams

A
31
Q

Rays passing through a glass block diagram

A
32
Q

Refractive index calculation

A
33
Q

Snells law calculation

A
34
Q

How to find refractive index of glass using glass block

A
35
Q

Types of internal reflection

A
36
Q

Snells law calculation for critical angle

A
37
Q

Internal reflection for optical fibres and prisms description

A
38
Q

How sound travels (wave)

A
39
Q

What displays sound waves and how it works

A
40
Q

Amplitude : increases then … also increases + low / high amplitude on oscilloscope

A
41
Q

Higher the frequency the … the ….

A

Higher

Pitch

42
Q 
Original sound
Higher pitched
Lower pitched
Higher pitched and louder
Waves
A
43
Q

How to use oscilloscope to find frequency

A

I

44
Q

How to use oscilloscope to measure speed of sound

Experiment

A

Y11 GCSE Physics (8 decks)

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