λ = v / f
where:
λ is the wavelength
v is the velocity of propagation (in this case, the speed of light, approximately 3 x 10^8 meters per second)
f is the frequency
Plugging in the values, we get:
λ = (3 x 10^8 m/s) / 100 Hz
λ = 3 x 10^6 meters
Therefore, the wavelength that has a frequency of 100 Hz is 3,000,000 meters, or 3 megahertz.
