Uses of EM waves Flashcards
1
Q
How are radio waves created
A
osculations in electrical circuits
2
Q
What happens when radio waves are absorbed
A
they create an alternating current of the same frequency to prior so can be used in communications
3
Q
what are the 3 ionising em waves
A
ultraviolet
x-rays
gamma rays
4
Q
what does ionising mean
A
damaging to our cells
5
Q
what two waves are used for communications
A
radio and micro waves
6
Q
where do gamma rays come from
A
radioactive decay
7
Q
where do x-rays, UV rays and visible light come from
A
when electrons drop down energy levels
8
Q
where do IR waves come from
A
bonds holding molecules vibrate together
