2.8 Flashcards
1
Q
what do waves do?
A
transfer energy from a source to other places without any matter being transferred
2
Q
what does electromagnetic radiation travel as?
A
waves and moves energy from one place to another
3
Q
what is frequency
measured?
A
no of waves per second produced by a source
hertz Hz
4
Q
order of electromagnetic spectrum
low freq long wave
A
radio micro infrared visible light ultra V x rays gamma
5
Q
higher frequency of wave…
A
higher energy
6
Q
velocity (m/) =
A
frequency (Hz) x Wavelength (m)
7
Q
radio waves
A
TV and radio
8
Q
microwaves
A
mobile phones
satellite
tv
cooking
9
Q
infrared
A
remote controls
10
Q
visible light
A
fibre optic cables
11
Q
uv
A
sun beds
12
Q
why are x rays and gamma not used in home?
A
damage the body
13
Q
what are x rays and gamma used in?
A
medicine for x rays and radiotherapy
