In the United States, police often monitor traffic with "K-band" radar guns,?

Question

which operate in the microwave region at 28.400 GHz (1 GHz = 109 Hz). Find the wavelength (in nm and angstroms) of this radiation.

Answer 1

For any wave, the following equation holds:
ν•λ = V
where ν the frequency of wave in 1/s, λ the wavelength of wave in m, and V the speed of wave in m/s. For any electro-magnetic wave (in this case as well), V is the speed of light c = 2.998x10^8m/s. Now please do the math.
Notice 1 GHz = 10^9 Hz