waves

Question 1

what are the 2 types of waves?

Answer 1

transverse and longitudinal

Question 2

what is a transverse wave?

Answer 2

when the particles of the medium move at right angles to the direction of travel of the wave

Question 3

what examples of transverse waves are there?

Answer 3

surface waves and electromagnetic waves

Question 4

what is a longitudinal wave?

Answer 4

the particles of the medium vibrate parallel to the direction of the wave

Question 5

what examples of longitudinal waves?

Answer 5

sound waves travelling through a material

Question 6

what happens to the size of the wave as it travels along in a transverse wave?

Answer 6

it decreases

Question 7

what is a compression?

Answer 7

where the coil is close together

Question 8

what is a rarefaction?

Answer 8

where the coil is spread out

Question 9

what is the wavelength?

Answer 9

the distance from the start of one wave to the next

Question 10

what is a crest or trough?

Answer 10

the top or bottom of the wave

Question 11

what is wavelength measured in?

Answer 11

metres

Question 12

what is the amplitude?

Answer 12

the maximum distance from the centre of the wave tp the top or bottom

Question 13

what is amplitude half of?

Answer 13

the height of the wave

Question 14

what is amplitude measured in?

Answer 14

metres

Question 15

what is frequency?

Answer 15

the number of waves in 1 second

Question 16

what is frequency measured in?

Answer 16

hertz (Hz)

Question 17

what are good surfaces for reflection?

Answer 17

flat and shiny

Question 18

what is the 90 degree to the mirror called?

Answer 18

the normal

Question 19

what is the light ray that hits the mirror called?

Answer 19

incident ray

Question 20

what is the light ray which bounces off the mirror?

Answer 20

reflected ray

Question 21

what is the law of reflection?

Answer 21

angle of incidence = angle of reflection

Question 22

what is the same after reflection?

Answer 22

speed, frequency and wavelength

Question 23

what changes after reflection?

Answer 23

wave direction

Question 24

what happens when light travels from air to glass?

Answer 24

light bends towards the normal

Question 25

why does light bend as it passes from air to glass?

Answer 25

slows down

Question 26

what happens when light travels from glass to air?

Answer 26

light bends away from the normal

Question 27

why does light bend when it passes from glass to air?

Answer 27

speeds up

Question 28

what does refraction mean?

Answer 28

change in direction

Question 29

what is the same after refraction?

Answer 29

frequency

Question 30

what is different after refraction?

Answer 30

speed, wavelength and direction

Question 31

the higher the density the slower the...

Answer 31

light travels

Question 32

what is the law of refraction?

Answer 32

angle of incidence is greater than the angle of reflection

Question 33

what is unusual about electromagnetic waves?

Answer 33

they can travel through a vacuum

Question 34

what are similar about electromagnetic waves?

Answer 34

they travel at the speed of light and they can all travel through a vacuum and are all transverse waves

Question 35

what are the 7 waves in the electromagnetic spectrum?

Answer 35

``` radio waves microwaves infra-red radiation visible light ultraviolet x-rays gamma rays ```

Question 36

what are radio waves used for?

Answer 36

transmitters in Aerials

Question 37

what are visible light and infra-red waves used for?

Answer 37

optical fibres

Question 38

what are microwaves used for?

Answer 38

mobile phone communication

Question 39

what is a satellite?

Answer 39

any object that orbits a planet

Question 40

what are natural satellites?

Answer 40

moon and plants that have moons

Question 41

what are artificial satellites?

Answer 41

man made objects put into space

Question 42

what are uses of satellites?

Answer 42

communication weather forecasting navigation

Question 43

what is a geosynchronous satellite?

Answer 43

has an orbit time of 24 hours and stays above the same ground position

Question 44

why does a geosynchronous satellite stay in a fixed position?

Answer 44

because it orbits in 24 hours which is the same time it takes for the earth to spin once

Question 45

what are the disadvantages of satellites?

Answer 45

they are affected by weather

Question 46

what are the advantages of optical fibres?

Answer 46

not affected by weather and are much quicker than satellites