EM uses and threats Flashcards
1
Q
Radio Waves: use
A
- TV signals
- radio signals
2
Q
Quality of Radio waves (4)
A
- longest wave in em spectrum
- can travel long distances
- can diffract around hills and curved surfaces
- carry info with energy they transfer
3
Q
Microwaves: use
A
- mobile phones
- satellite TV
4
Q
Quality of microwaves
A
-pass easily through earth’s watery atmosphere
5
Q
Danger of microwaves?
A
- emit microwaves radiation
- can be harmful to bells (cell damage)
- hasn’t been proven (insufficient evidence)
6
Q
Infrared radiation: use
A
- remote controls
- fibre optic cables
7
Q
Infrared qualities
A
no loss of signal in fibre optics cuz total internal reflection
8
Q
infrared hazard
A
overheating
9
Q
UV uses
A
- tanning of skin
- detecting forgeries
10
Q
UV dangers
A
-can cause skin cancer
11
Q
Xray uses
A
xray machine to create images of bones/teeth
12
Q
Xray Dangers
A
-overexposure could lead to cancer/cell mutation
13
Q
Gamma uses
A
- destroy cancer cells (radio therapy)
- sterilise equipment
14
Q
Quality of gamma waves
A
shortest wavelength in EM spectrum
15
Q
Dangers of gamma waves
A
overexposure can cause cell mutation/ cancer
