What is the wavelength of microwaves of 3.0 X 10^9 Hz frequency?

Given,

Frequency of microwaves = 3 x 10^9 Hz

We know that,

Velocity (c) = Frequency x Wavelength

Velocity of light (c) = 3 x 10^8 m/s

Therefore,

Wavelength = Velocity : Frequency = (3 x 10^8) : (3 x 10^9) = 0.1 m