Waves

Question 1

2 types of waves

Answer 1

transverse and longitudinal

Question 2

transverse waves

Answer 2

waves that vibrate or oscillate perpendicular to the direction of energy transfer

Question 3

where can transverse waves move

Answer 3

• in solids and on the surface of liquids

Question 4

what do transverse waves transfer

Answer 4

energy

Question 5

which types of waves can move in solids, liquids and gases in a vacuum

Answer 5

electromagnetic waves

Question 6

the highest point above the rest position in a T wave

Answer 6

peak/crest

Question 7

lowest point below the rest position in a T wave

Answer 7

trough

Question 8

examples of transverse waves

Answer 8

• EM waves
• S waves
• vibrations in a guitar string

Question 9

longitudinal waves

Answer 9

where the points along its length vibrate parallel to the direction of energy transfer

Question 10

where can longitudinal waves move

Answer 10

solids, liquids and gases

Question 11

where can longitudinal waves not move

Answer 11

in a vacuum

Question 12

when the waves are close together in L waves they are called

Answer 12

compressions

Question 13

when waves are spaced apart in longitudinal waves they are called

Answer 13

rarefactions

Question 14

examples of longitudinal waves

Answer 14

• sound waves
• Pressure waves
• P waves

Question 15

pressure in T waves

Answer 15

constant

Question 16

pressure in L waves

Answer 16

changes in pressure

Question 17

when are L waves the fastest

Answer 17

solid

Question 18

when are T waves the fastest

Answer 18

vacuum

Question 19

waves

Answer 19

oscillations or vibrations about a fixed point

Question 20

what do waves transfer

Answer 20

energy

Question 21

what do waves not transfer

Answer 21

matter

Question 22

amplitude

Answer 22

distance from the undisturbed position to the peak or trough of a wave

Question 23

what is amplitude easured in

Answer 23

metres (m)

Question 24

wavelength

Answer 24

distance from one point on the wave to the same point on the next wave

Question 25

how is wavelength measured in L waves

Answer 25

from the centre of one compression to the centre of the next

Question 26

wavelength symbol

Answer 26

lamba (wave)

Question 27

frequency

Answer 27

the number of waves passing a point in a second

Question 28

what is symbol and measurement of frequency

Answer 28

f Hertz (Hz)

Question 29

time period

Answer 29

the time taken for a single wave to pass a point

Question 30

time period measurement

Answer 30

seconds (s)

Question 31

Frequency equation

Answer 31

f= 1/T

Question 32

Wave equation

Answer 32

wave speed= frequency x wavelength

Question 33

doppler effect

Answer 33

the apparent change in wavelength and frequency of a wave emitted by a moving source

Question 34

doppler effect in ambulance

Answer 34

- frequency of the sound waves emitted by the siren goes from high to low pitch

Question 35

waves on a stationary object

Answer 35

spread out symmetrically

Question 36

what happens to the waves when an object begins to move

Answer 36

waves get squashed together at one end and streched on the other end

Question 37

electromagnetic waves

Answer 37

transverse waves that transfer energy from the source of the waves to an observer

Question 38

properties of EM waves

Answer 38

- all transverse - all travel through a vacuum - they all travel at the same speed in a vacuum

Question 39

what do EM waves form

Answer 39

continuos spectrum

Question 40

EM waves

Answer 40

radio microwaves infrared visible light ultraviolet x-rays gamma rays

Question 41

the higher the frequency=

Answer 41

the higher the radiation

Question 42

radiation with higher energy is =

Answer 42

highly ionising harmful to cells and tissues causing cancer

Question 43

visible light

Answer 43

range of wavelengths which are visible to humans

Question 44

visible light percentage of the EM spectrum

Answer 44

0.0035%

Question 45

which color has the longest wavelength and lowest frequency

Answer 45

red

Question 46

which colour has the shortest wavelength and highest frequency

Answer 46

violet

Question 47

what is inversely proportional to wavelength

Answer 47

frequency

Question 48

radio waves uses

Answer 48

communication (radio and TV)

Question 49

microwave uses

Answer 49

heating food communication (WIFI, mobiles, satellites)

Question 50

infrared uses

Answer 50

- heating or cooking - motion sensors - remote controls - electric heaters - infrared cameras

Question 51

visible light uses

Answer 51

- seeing and taking photographs - fibre optic communications

Question 52

ultraviolet uses

Answer 52

- security marking - fluorescent bulbs - getting a suntan

Question 53

x ray uses

Answer 53

- x ray images

Question 54

gamma rays

Answer 54

- sterilizing medical instruments - treating cancer

Question 55

microwaves danger

Answer 55

possible heat damage to internal organs

Question 56

infrared danger

Answer 56

skin burns

Question 57

visible light danger

Answer 57

bright light can cause eye damage

Question 58

UV light danger

Answer 58

eye damage sun burn skin cancer

Question 59

x rays and gamma rays danger

Answer 59

kills cells mutations cancer