Waves

Question 1

Define wavelength

Answer 1

Distance from one peak to the next

Question 2

Frequency

Answer 2

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

F = 1/t

Question 3

Frequency and time equation

Answer 3

F = 1 /t

Question 4

Amplitude

Answer 4

Height of the wave (from rest to crest)

Question 5

Speed (waves)

Answer 5

(v, for velocity)

How fast the wave goes

Question 6

Period

Answer 6

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

Question 7

Diagram showing labelled wave

Answer 7

Question 8

Formula

Wave speed
Frequency
Wavelength

Answer 8

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

V = f x wavelength

Question 9

Describe transverse wave

Answer 9

Question 10

Describe longitudinal wave

Answer 10

Question 11

Wave and matter statement

Answer 11

Waves transfer energy and information without transferring matter

Question 12

Describe Doppler effect

Answer 12

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

Question 13

Electromagnetic spectrum

Names in order smallest frequency to largest

Answer 13

Question 14

Radio waves uses

Answer 14

Communications

• transmitted a long way
• TV and radio broadcasting

Question 15

Microwaves used

Answer 15

Satellite communications and cooking

Question 16

Infra-red radiation use

Answer 16

Heating and to monitor temperature

Warm / heat food
Night vision equipment

Question 17

Light signals uses

Answer 17

Travel through optical fibres

Communication

Telephone and broadband internet cables

Medical (see inside the body)

Question 18

Visible light uses

Answer 18

Photography

Cameras

Question 19

Ultraviolet uses

Answer 19

Fluorescent lamps

Question 20

X Rays uses

Answer 20

See inside things

Question 21

Gamma radiation uses

Answer 21

Sterilising medical equipment (kills microbes)

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

Question 22

EM radiation can be

Why

Answer 22

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)

Question 23

The higher the frequency the more … waves are

Answer 23

Dangerous

Question 24

Diffuse reflection

Answer 24

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

Question 25

Clear reflection

Answer 25

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

Question 26

Law of reflection

Answer 26

Angle of incidence = angle of reflection

Question 27

Normal

Answer 27

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

Question 28

Angle of incidence

Answer 28

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

Question 29

Reflection wave diagram

Answer 29

Question 30

Wave refraction diagrams

Answer 30

Question 31

Rays passing through a glass block diagram

Answer 31

Question 32

Refractive index calculation

Answer 32

Question 33

Snells law calculation

Answer 33

Question 34

How to find refractive index of glass using glass block

Answer 34

Question 35

Types of internal reflection

Answer 35

Question 36

Snells law calculation for critical angle

Answer 36

Question 37

Internal reflection for optical fibres and prisms description

Answer 37

Question 38

How sound travels (wave)

Answer 38

Question 39

What displays sound waves and how it works

Answer 39

Question 40

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

Answer 40

Question 41

Higher the frequency the … the ….

Answer 41

Higher | Pitch

Question 42

``` Original sound Higher pitched Lower pitched Higher pitched and louder Waves ```

Answer 42

Question 43

How to use oscilloscope to find frequency

Answer 43

I

Question 44

How to use oscilloscope to measure speed of sound | Experiment

Answer 44