The electric field for an em wave is: E = E0sin[(12 x 1015 t – 4 x 107 x)]. What is the speed of the em waves?
48 x 108 m / s
12 x 1015 m / s
4 x 107 m / s
3 x 108 m / s
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.