[physics] electromagnetic spectrum Flashcards
1
Q
what is electromagnetic waves
A
electromagnetic waves are made up of oscillating electric and magnetic fields
2
Q
what type of waves are electromagnetic waves
A
transverse waves
3
Q
properties of electromagnetic waves as transverse waves
A
- the electric and magnetic fields oscillate perpendicularly to the direction of propagation of the electromagnetic waves
4
Q
do electromagnetic waves carry electric charge
A
no
5
Q
characteristics of electromagnetic waves
A
- all electromagnetic waves can travel without a medium
- all electromagnetic waves travel with the same speed of 3.0×10^8 m/s in a vacuum
- electromagnetic waves undergo reflection and refraction
- electromagnetic waves transfer energy
6
Q
wave speed equation
A
v=f人
7
Q
when electromagnetic waves travel from one medium to another, what changes?
A
- speed changes
- wavelength changes
- frequency doesn’t change
8
Q
main regions of electromagnetic spectrum (increasing freqeuncy)
A
- radio waves
- microwaves
- infrared radiation
- visible light (7 colours of rainbow)
- ultraviolet radiation
- x-rays
- gamma rays
