waves

Question 1

wave:

Answer 1

transfer energy from one place to another

Question 2

transverse wave:

Answer 2

oscillations are perpendicular to the direction of energy transfer

Question 3

transverse wave example:

Answer 3

water wave

Question 4

transverse wave demonstrated by..

Answer 4

moving spring up and down (vertically)

Question 5

longitudinal wave:

Answer 5

oscillations are parallel to the direction of energy transfer

Question 6

longitudinal wave example:

Answer 6

sound wave

Question 7

longitudinal wave demonstrated by

Answer 7

moving a slinky back and forward horizontally

Question 8

frequency

wave

Answer 8

number of waves passing through a fixed point in seconds

Hertz

Question 9

amplitude

wave

Answer 9

the maximum displacement that any particle achieved from its undisturbed position
(metres)

Question 10

wavelength

wave

Answer 10

distance from one peak of the wave to the equivalent point on the next wave
(metres)

Question 11

period

wave

Answer 11

time taken for one complete oscillation

seconds

Question 12

PERIOD=

Answer 12

1
——————-
FREQUENCY

Question 13

amplitude indicates

Answer 13

amount of energy wave is carrying

Question 14

speed of wave=

Answer 14

the speed at which the energy is transferred

Question 15

WAVE SPEED =

Answer 15

FREQUENCY x WAVE LENGTH

Question 16

wave speed is a measure

Answer 16

of how far the wave moves in 1 second

Question 17

electromagnetic waves are

Answer 17

transverse waves

Question 18

when a wave passes from 1 medium to another it can be

Answer 18

refracted + change direction

Question 19

direction of refraction depends on:

Answer 19

• angle at which the wave hits the boundary

- materials involved

Question 20

material with low to high refractive index

Answer 20

bends towards normal

Question 21

material with high to low refractive index

Answer 21

bends away from the normal

Question 22

refraction is due

Answer 22

to the difference in wave speed

Question 23

ray diagrams are used to

Answer 23

show when waves reach a boundary between 1 medium and another, they can be refracted

Question 24

ray diagrams represent

Answer 24

how light moves from 1 place to another

Question 25

radio waves:

Answer 25

• radio/television

- low energy/not harmful

Question 26

microwaves:

Answer 26

• satellite/food cooking/communication

- travel at straight lines/transmit signals to satellites/travels back down to receive

Question 27

infrared waves:

Answer 27

• electrical heaters/cooking food/infrared cameras

- glow hot red when electricity flows/transmit energy which is absorbed by food and converts back into heat

Question 28

visible light:

Answer 28

• fire optic/communications

- travels optical fibres from 1 end to other without being lost

Question 29

ultraviolet waves

Answer 29

• energy efficient lightbulbs/sun beds

- produced by gas by current(Lbulb)

Question 30

x rays

Answer 30

• medical treatment

- penetrate soft tissue show shadow of bones

Question 31

gamma rays

Answer 31

• sterilising food/treat tumours

- most energetic/used to destroy bacteria+tumours

Question 32

radio waves are caused

Answer 32

by oscillations in electrical circuits

Question 33

the frequency of radio waves produced matches the…

Answer 33

frequency of the electrical oscillation

Question 34

em waves caused

Answer 34

changes in atoms + nuclei

Question 35

ultraviolet waves:

Answer 35

cause skin to age/ increase risk of skin cancer

Question 36

xrays + gamma rays:

Answer 36

ionising radiation- damages cells by ionising