the electromagnetic spectrum Flashcards
1
Q
how fast do all electromagnetic waves travel at in a vacuum?
A
3x10^8m/s
2
Q
what has more frequency, gamma or radio?
A
gamma
3
Q
which has a higher wavelength, infrared or ultraviolet?
A
infrared
4
Q
uses of infrared
A
optical fibres
remote controls
ovens
thermal imaging
5
Q
uses of microwaves
A
navigation (GPS)
cooking
drying
mobile phones
6
Q
uses of radio waves
A
radio
bluetooth
remote control car
7
Q
uses of visible light
A
photosynthesis
optical fibres
torches
cameras
8
Q
2 main uses of gamma rays
A
- killing harmful bacteria in food or on surgical equipment
- cancer treatment
9
Q
main use of x-rays
A
medical imaging
10
Q
define ionisation
A
when an atom loses an electron due to x-rays or gamma rays passing through a substance.
11
Q
damage of ionisation happening to living cells
A
it can damage cells and potentially cause cancer
12
Q
how can x-rays be blocked?
A
bones
teeth
metal inside body
