An electromagnetic wave traveling through a vacuum has a wavelength of .15 meter. What is the period of this electromagnetic wave?
4 years ago Comment
Tools we'll need:
Speed of EM wave in vacuum = 3 x 10⁸ meters per second.
Frequency = (speed) / (wavelength)
Period = 1/frequency
Period = (wavelength) / (speed) = (0.15) / (3 x 10⁸) = 0.5 nanosecond
( "nano..." = 10⁻⁹ )