Waves

Question 1

What is the amplitude of a wave

Answer 1

The distance from the middle to the crest or trough

Question 2

Frequency =

Answer 2

Number of waves per second

Question 3

What is frequency measured in

Answer 3

Hertz

Question 4

In a transverse wave the vibrations are…. To the direction of energy transfer

Answer 4

Perpendicular

Question 5

In longitudinal waves the waves are …to the direction of energy transfer

Answer 5

Parallel

Question 6

Wave speed=

Answer 6

Frequency x wavelength

Question 7

In relflection the angle of incidence is= to what?

Answer 7

The angle of reflection

Question 8

Where is an image formed in a mirror

Answer 8

Behind it

Question 9

When constructing a diagram to show how images are formed in mirrors one of the ray arrows goes beyond the mirrow from where does this ray begin

Answer 9

The eye

Question 10

Any lines going behind the mirror when drawing a diagram of reflection should be

Answer 10

Dotted

Question 11

When does diffraction occur

Answer 11

When a wave passes though a gap or obstacle

Question 12

The level of diffraction depends on what

Answer 12

The size of the gap releative to it’s wavelength

Question 13

When does maximum diffraction take place

Answer 13

When the size of the gap is equal to the wavelength

Question 14

Name the em waves in order

Answer 14

Radio 
Micro 
Infra red 
Visible 
Ultra violet 
X rays 
Gamma rays

Question 15

Radio waves have the….wavelength

Answer 15

Biggest

Question 16

Which rays have the shortest wavelength

Answer 16

Gamma rays

Question 17

The higher the frequency the

Answer 17

Shorter the wavelength

Question 18

Why doesn’t the receiver of radio waves need to be in line of sight

Answer 18

Because it can diffract

Question 19

Why are microwaves used for satellite communication rather than radio waves

Answer 19

Because they can pass through the atmosphere where as radiowaves are reflected by it

Question 20

How do satellites work

Answer 20

Signal sent from transmitter to space
Satellite picks up signal
The signal is retransmitted to a new place
The satellite on the ground picks up the signal

Question 21

How do mobile phones work

Answer 21

They use microwaves to transmit to the nearest mast

Question 22

Why do some people think using phones and living near a mast can cause Heath damage

Answer 22

Water absorbs microwaves and causing the water to heat up . The water in the cells can heat thus “cooking” the cells

Question 23

How do remote controls work

Answer 23

They emit different patterns of infrared waves which send the command

Question 24

Optical fibres can carry data… And …

Answer 24

Over long distances

Quickly

Question 25

How do optic fibres work

Answer 25

They pulse light which is reflected by the core of the fibre

Question 26

What is used in a camera to focus the light

Answer 26

The lens

Question 27

What is the role of the aperture in a camera

Answer 27

To control the amount of light that can enter the camera

Question 28

What is the light put onto in a camera

Answer 28

Film or a Light sensitive sensor

Question 29

What causes sound waves

Answer 29

Vibrating objects

Question 30

What type of waves are sound

Answer 30

Longitudinal

Question 31

What state does sound travel faster in

Answer 31

Solid

Question 32

Where is there no sound

Answer 32

In a vaccum

Question 33

What is a sound wave reflecting called

Answer 33

An echo

Question 34

Why does a room packed with objects echo less than an empty room

Answer 34

Because the objects absorb the sound

Question 35

High frequency =

Answer 35

High pitch and short wavelength

Question 36

Bigger amplitude =

Answer 36

Louder sound

Question 37

Wave length =

Answer 37

Distance between two points the same on seperate waves (crest to crest)