EM spectrum Flashcards
1
Q
what type of waves are EM?
A
transverse
2
Q
what speed do they travel at?
A
speed of light - 3 x 10-8 m/s
3
Q
what are the trends in frequency and wavelength from radiowaves to gamma rays?
A
increasing frequency
decreasing wavelength
4
Q
use of radiowaves
A
- broadcasting
- communication
5
Q
uses of microwaves
A
- cooking
- satellite communications
6
Q
uses of infra red
A
- heaters
- night vision
- cooking
- remote controls
7
Q
uses of visible light
A
- photography
- optical fibres
8
Q
uses of ultra violet
A
- fluorescent lamps
9
Q
uses of x-rays
A
observing internal structure of objects and materials
10
Q
uses of gamma rays
A
- sterilising equipment
- diagnosis and cancer treatment
11
Q
dangers of microwaves
A
- internal heating of body tissue
12
Q
dangers of infra red
A
skin burns
13
Q
dangers of ultra violet
A
damage to surface cells and blindness
14
Q
dangers of gamma rays
A
cancer
cell mutation
