1
Q
Characteristic of em waves
A
transverse
travel at 3x10^8 in vacuum
em waves transfer energy
v=fa
2
Q
What happens when wave travel to another media
A
speed and wavelength decrease
freq the same
3
Q
relationship iof em waves
A
higher temp higher freq of em waves
4
Q
Electromagnetic spectrum
A
radiowave 10-1
microwave 10-2
infrared 10-3
visible light 10-6
ultraviolet 10-8
xray 10-8
gamma ray 10-12
(rmivuxg)
5
Q
Harmful effects of overexposure
A
sunburn
ionising radiation
6
Q
Radio waves
A
- used in radio and television communications
7
Q
Microwae
A
use in microwave. satellite teleivision
8
Q
Infrared
A
used in cooking or keep warm
9
Q
visible light
A
photography and photographic
10
Q
Ultraviolet
A
photography and photographi, sunbedc
11
Q
x-ray
A
disinfection and medical radio
