Let's write down some variables:
f: frequency; f = 650000 Hz
c: speed of light (radio waves); c = 3*10^8 m/s
λ: wavelength; this is what we're solving for
Given these variables, we can use the following equation to solve for λ:
c = fλ
Plugging in our known variables, we get
3*10^8 = 650000λ
Solving for λ, we get that
λ = 461.538 m
