EM radiation Flashcards
1
Q
what is EM radiation?
A
Energy propagated through free space or through a medium in the form of EM waves. It refers to the emission and transmission of the energy
2
Q
What type of energy does short wavelengths have?
A
High
3
Q
What is EM waves characterised by?
A
Intensity and frequency of the time variation of electric and magnetic fields
4
Q
What speed does EM travel at?
A
Universal speed of light through free space or a material medium in the form of electric or magnetic fields
5
Q
EM properties
A
All:
- travel through a vacuum
- travel at the speed of light
- travel in straight lines
- obey ISL
- result from the change in motion of electric changes
