What is the frequency of microwaves with wavelength of 20-mm? (c = 3.0 x 10^8 m/s) a. 15 GHz b. 100 MHz c. 400 MHz d. 73 GHz

Let's assume these microwaves are traveling in a vacuum, then this equation holds true:

c = fλ

c is the speed of light in a vacuum, f is the frequency, and λ is the wavelength.

Given values:

c = 3*10⁸m/s

λ = 20*10⁻³m

Plug in the values and solve for f:

3*10⁸ = f (20*10⁻³)

f = 15GHz

Choice A