Question

An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60cm.
Find
The velocity of the wave
Name medium in which it is travelling.

Answer 1

speed of electromagnetic wave = (wavelength) * frequency

All emf waves travel at the speed of light 3.00 x 10^8 m/s in a vacuum (no collision with molecules).

Answer 2

Mega stands for 10^6 of some unit.

speed of emf wave = (wavelength) * frequency = 60 *10^-2 m * 500 * 10^6 s^-1
= 300,000,000 m/s
so the medium must be a vacuum

Answer 3

ie, there is no medium.

Answer 4

the refractive index is exactly 1