Waves

Question 1

What is a transverse wave?

Answer 1

When the vibrations are perpendicular (90) to the direction of energy transfer of the wave

Question 2

What is a longitudinal wave?

Answer 2

When the vibrations are parallel to the direction of energy transfer of the wave

Question 3

What is the electromagnetic spectrum?

Answer 3

Radio waves 
Micro waves 
Infrared 
Visible light 
Ultra violet 
X Ray 
Gamma rays

Question 4

What is the order of the electromagnetic spectrum based on?

Answer 4

Increasing frequency and energy
Decreasing wavelength

EMs with a higher frequency have a shorter wavelength

Question 5

What is the wavelength of the EM spectrum between?

Answer 5

10 to the power -16 metres and 10 to the power 4 metres

Question 6

What is the speed of the EM waves I’m a vacuum

Answer 6

3x10 to the power 8m/s

Question 7

What are the used of radio waves?

Answer 7

Communicating
Broadcasts
Radar

Question 8

What are the uses of microwaves?

Answer 8

Satellite communication

Cooking

Question 9

What are the uses of infrared?

Answer 9

Cooking
Remotes
Thermal imaging
Optical fibres

Question 10

What are the uses of visible light?

Answer 10

Optical fibres

Endoscopes

Question 11

What are the uses of ultraviolet?

Answer 11

Security markings
Identifying forged bank notes
Fluorescent tubing

Question 12

What are the uses of X-Ray’s?

Answer 12

Medical imaging

Airport security

Question 13

What are the uses of gamma rays?

Answer 13

Radio therapy

Sterilise medical equipment

Question 14

What are the dangers of radio waves?

Answer 14

None

Question 15

What are the dangers of microwaves?

Answer 15

Heating water in tissues=burning

Question 16

What are the dangers of infrared?

Answer 16

Causes burning in human tissue

Question 17

What are the dangers of visible light?

Answer 17

Activates sensitive cells in the retina

Question 18

What are the dangers of ultra violet?

Answer 18

High=kills cells

Low=causes cancer

Question 19

What are the dangers of X rays?

Answer 19

High=kills cells

Low=causes cancer

Question 20

What are the dangers of gamma rays?

Answer 20

High=kills cells

Low=causes cancer

Question 21

What is a virtual image?

Answer 21

An image that cannot be projected such as the one in a mirror

Question 22

What is frequency

Answer 22

The number of waves per second

Question 23

What are the rules about a virtual image?

Answer 23

The image is the same size as the object
The image is the same distance away
The image is upright
It is laterally inverted

Question 24

What type of waves are sound waves?

Answer 24

Longitudinal

Question 25

What are echoes?

Answer 25

Echoes are reflected waves of sound

Question 26

When are sound waves reflected?

Answer 26

When they meet hard flat surfaces

Question 27

When are sound waves refracted?

Answer 27

When they enter denser material they speed up

Question 28

What is high and low frequency?

Answer 28

Low frequency=low pitch and short wavelength | High frequency=high pitch and long wavelength

Question 29

What determines the loudness of the sound?

Answer 29

The amplitude of the sound wave, the bigger the amplitude the louder the sound

Question 30

How to know amplitude?

Answer 30

The distance between the centre line and top of crest

Question 31

How to know wavelength?

Answer 31

The distance between any point on one wave to the same point on the next wave along

Question 32

What are examples of longitudinal waves?

Answer 32

Sound waves and ultrasound waves Shock waves e.g. Seismic waves A slinky spring when you push the end

Question 33

What are examples of transverse waves?

Answer 33

Light and all other EM waves Ripples on water Waves on strings A slinky wiggled up and down

Question 34

What does loudness depend on?

Answer 34

Amplitude | The bigger the amplitude the louder the sound

Question 35

How can long radio waves be transmitted over a large distance? 1-10km

Answer 35

The long wavelength diffracts around the curves earths surface meaning signals can be received even if the receiver isn't in line with the transmitter

Question 35

How can short wave radio signals be transmitted over long distances? 10m-100m

Answer 35

They're reflected from the ionosphere (an electrically charged layer in the earths upper atmosphere) Médium eave signals can also do this depending on atmospheric conditions and the time of day

Question 35

How do micro waves work?

Answer 35

Signal from a transmitter is transmitted into space It is picked up by a satellite receiver dish orbiting the earth The satellite transmits the signal back to earth in a different direction where it's received by a satellite dish on the ground

Question 36

Where does sound travel faster and where can't it travel?

Answer 36

Faster in solids | Can't travel In a vacuum

Question 37

What is frequency in sound?

Answer 37

The number of complete vibrations per second

Question 38

How is visible light used for photography?

Answer 38

Cameras use a lens to Focus visible light onto the light sensitive film