An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm, then find the speed of the wave.
6×108 m/s
3×108 m/s
9×108 m/s
12×108 m/s
We have f = cλ [frequency = speedwave length]
c = f×λ
⇒ c = 500×106×60×10−2
⇒c = 3×108 m/s
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?