Question

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.

1. 1. Calculate the speed of the wave.
   2. Name the medium through which it is traveling.

Answer 1

a. We know that, 

v = f λ 

Here it is given that c = 3 × 10⁸ m/s

and, f = 500 MHz = 500 × 10⁶ Hz

λ = 60 cm = 0.6 m 

∴ v = (500 × 10⁶ ) × (0.6) = 3 × 10⁸ m/s

which is the same as the velocity of the e-m wave in vacuum or air.

b. The medium through which it is travelling is either air or vacuum.