[physics] electromagnetic spectrum
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what is electromagnetic waves
electromagnetic waves are made up of oscillating electric and magnetic fields
what type of waves are electromagnetic waves
transverse waves
properties of electromagnetic waves as transverse waves
• the electric and magnetic fields oscillate perpendicularly to the direction of propagation of the electromagnetic waves
do electromagnetic waves carry electric charge
no
characteristics of electromagnetic waves
• 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
wave speed equation
v=f人
when electromagnetic waves travel from one medium to another, what changes?
• speed changes • wavelength changes • frequency doesn’t change
main regions of electromagnetic spectrum (increasing freqeuncy)
• radio waves • microwaves • infrared radiation • visible light (7 colours of rainbow) • ultraviolet radiation • x-rays • gamma rays