p6 waves

Question 1

mechanical wave

Answer 1

waves that involve particles moving, or oscillating e.g sound waves

Question 2

electromagnetic waves

Answer 2

waves that don’t involve any particles oscillating, instead they involve vibrations

Question 3

transverse wave

Answer 3

oscillations are perpendicular to the direction of ebergy transfer

Question 4

longitudinal waves

Answer 4

oscillation are parallel to the direction of energy transfer, showing areas of compression and rarefaction

Question 5

what type of wave are electromagnetic

Answer 5

transverse waves

Question 6

what is a wave

Answer 6

carries energy from one place to another, and can also carry information. They involve oscillations, allowing energy to be transferred without having to flow or travel from one place to another

Question 7

oscillations

Answer 7

vibrations or movements

Question 8

perpendicular

Answer 8

at right angles to

Question 9

amplitude

Answer 9

maximum displacement of a point on the wave from the undisturbed position

Question 10

wavelength

Answer 10

the distance from a point on one wave to the equivalent point on the next wave along

Question 11

frequency

Answer 11

number of complete waves that pass a point per second

Question 12

period

Answer 12

time period of a wave is the time it takes to complete a full wave

Question 13

an absorber

Answer 13

an object which absorbs the wave

Question 14

what do all electromagnetic waves do

Answer 14

travel at the same velocity through a vacuum (empty space)

Question 15

which electromagnetic wave has the longest wavelength

Answer 15

radio waves

Question 16

which electromagnetic wave has the shortest wavelength

Answer 16

gamma rays

Question 17

which electromagnetic wave has the lowest frequency

Answer 17

radio waves

Question 18

which electromagnetic wave has the highest frequency

Answer 18

gamma rays

Question 19

properties of electromagnetic waves

Answer 19

can be reflected, refracted, absorbed or transmitted

Question 20

when does refraction occur

Answer 20

when a wave changed the medium it is travelling through,

Question 21

refraction

Answer 21

change in direction of a wave due to a change in the medium it is travelling through

Question 22

reflection

Answer 22

rebouding a wave from a surface. The angle between the incident ( in-going ) and the normal is the same as the angle between the reflected wave and the normal

Question 23

absorption

Answer 23

taking in energy from a wave and transferring it to another form, usually heat

Question 24

transmission

Answer 24

a wave travelling through a material e.g visible light waves transmitted through the air to your eyes

Question 25

media

Answer 25

singular medium

Question 26

normal

Answer 26

a construction line at right angle to a surface at the point where the wave hits the surface

Question 27

how are electromagnetic waves generated

Answer 27

by changes in atoms.

Question 28

how are radio waves produced

Answer 28

by oscillation on electrical circuits. The radio waves create an alternating current with the same frequency as the radio wave itself

Question 29

what waves are dangerous to human tissue

Answer 29

UV waves, X-rays and gamma rays (how severe the effects are depends on the type of radiation and the dose received)

Question 30

how is a dose of radiation measured

Answer 30

according to how great the risk of harm on the human body is

Question 31

radiation dose

Answer 31

risk of harm due to exposure to radiation

Question 32

exposure

Answer 32

recieving and absorbing radiation by the body

Question 33

slevert

Answer 33

the measure of radiation dose

Question 34

ionising

Answer 34

describes radiation that forms ions by 'knocking' electrons off atoms to make ions

Question 35

cancer

Answer 35

disease caused by mutation to dna, resulting in cells dividing out of control

Question 36

how are radio waves used

Answer 36

television, radio and bluetooth - a signal carried by radio waves can get from a transmitting mast to a receiver by being reflected off a layer in the atmosphere

Question 37

how are microwaves used

Answer 37

heat food, communications with satellites - microwaves can pass through the atmosphere.

Question 38

how are infrared waves used

Answer 38

electrical heaters, certain cameras - All objects emit infrared by hotter object emit more

Question 39

how is visible light used

Answer 39

fibre optic communication - reflect pulses of light all the way along their length, transmitting information

Question 40

how are UV waves used

Answer 40

tanning beds

Question 41

how are x rays used

Answer 41

medical imaging

Question 42

how are gamma rays used

Answer 42

medical treatments such as radiotherapy