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what are the seven types of EM
radio waves
microwaves
infrared
visible light
ultraviolet
x-rays
gamma rays
why does the EM spectrum go in that order?
longest wavelength (lowest frequency and energy) to shortest wavelength (highest frequency and energy)
what is the wavelength for radio waves
thousands of km to 30cm
what is the wavelength for microwaves
30cm to 1mm
what is the wavelength for infrared light
1mm to 750nm
what is the wavelength for visible light
750nm to 400nm
what is the wavelength for ultraviolet light
down to 1nm
what is the wavelength for x-rays
1nm to 10pm
what is the wavelength for gamma rays
less than 10 pm