Electromagentic Spectrum

Question 1

what is the amplitude of a wave

Answer 1

the displacement from the rest position to a crest or trough

Question 2

what is wavelength

Answer 2

the length of a full wave, from crest to crest or trough to trough

Question 3

what is the equation to calculate the frequency/ period of a wave

Answer 3

f=N/t

Question 4

how do vibrations travel in transverse waves

Answer 4

the vibrations are perpendicular (at 90 degrees) to the direction the wave travels.

Question 5

what kind of waves are electromagnetic waves

Answer 5

transverse

Question 6

how do vibrations travel in longitudinal waves

Answer 6

the vibrations are parallel to the direction the wave travels

Question 7

what is the wave speed equation

Answer 7

v= d/t or v= fλ

Question 8

what is diffraction

Answer 8

when waves spread out, which also causes the energy to spread out

Question 9

how does gap size affect diffraction

Answer 9

the smaller the gap, the more diffraction occurs

Question 10

how does wavelength affect diffraction

Answer 10

the longer the wavelength the more diffraction happens

Question 11

what is the order of all waves in the EM spectrum

Answer 11

radio waves, micro waves, infra red, visible light, UV, x rays, gamma rays

Question 12

what speed do all EM waves travel at in a vacuum

Answer 12

the speed of light, 3.00 x 10*8 ms-1

Question 13

what is meant by the term refraction

Answer 13

where waves change speed at a boundary

Question 14

how does density affect refraction

Answer 14

the higher the density of a material, the slower the wave travels

Question 15

what happens to the frequency when the wave refracts

Answer 15

the frequency stays the same

Question 16

what happens when a wave crosses form a less dense to a more dense medium

Answer 16

the wave will slow down, the wavelength will decrease, and it will bend towards the normal

Question 17

what happens to a wave when it refracts when travelling along the normal

Answer 17

the speed will change but the direction of the wave will not

Question 18

what is a use for radio waves

Answer 18

they can be used to transmit information

Question 19

what can micro waves be used for

Answer 19

to cook food

Question 20

name a use of infrared radiation

Answer 20

to monitor temperature

Question 21

state a use of visible light signals

Answer 21

it can be used for communication using optical fibres

Question 22

what can ultraviolet be used for

Answer 22

it can be used in tanning salons to give people a fake tan

Question 23

what are x rays used for

Answer 23

to view bones in hospitals

Question 24

state a use of gamma rays

Answer 24

the sterilisation of medical instruments

Question 25

what objects emit gamma rays

Answer 25

they are emitted during the nuclear decay of some radioactive nuclei

Question 26

what can emit radio waves

Answer 26

radio transmitters

Question 27

infrared radiation is emitted by…

Answer 27

any object, the hotter the object the more radiation it gives out

Question 28

xrays can be produced in

Answer 28

xray machines

Question 29

a source of ultraviolet is

Answer 29

the sun

Question 30

what can microwaves be emitted by

Answer 30

microwave ovens

Question 31

a source of visible light is…

Answer 31

light bulbs