EM Spectrum Flashcards
1
Q
Name all 7 EM waves
A
Radio, microwave, infra red, visible, ultraviolet, x-ray,gamma
2
Q
Name uses of radio waves
A
- Radio and TV broadcasting
- Bluetooth communication
3
Q
Name uses of microwaves
A
- Cooking (absorbed by water molecule, heats it up)
- Sends phone signals
- Satellite tv
4
Q
Name uses of Infra red waves
A
- Detect heat (thermal cameras, heat sensors(
- Ovens and toasters use IR to cook food
- Remote controls
5
Q
Name uses of ultra violet waves
A
- Invisible ink
- Sterilise food and medical equipment
- Detect forged banknotes
6
Q
Uses of X-rays
A
- See inside our bodies
- Can kill cancerous cells
7
Q
Uses of gamma rays
A
- Kills cells when absorbed
- Sterilise food by killing bacteria
- Kills cancerous cells
8
Q
UV light, X-rays and gamma rays can all cauce cells to become..
A
cancerous
9
Q
Things stay the same temperature if…
A
they absorb and emit the same amounts of power
10
Q
The earth is constantly absorbing and emitting…
A
infra red radiation from the sun
11
Q
Why is global warming happening?
A
Burning fossil fuels creates excess amounts of co2. The earth is no longer emitting the same amount it is absorbing, so the planet warms up.
12
Q
What 2 things do all EM waves have in common?
A
- Travel in a vaccum
- All are transverse waves
