The wavelength is measured in meters and Hertz is 1/seconds so, we have the equation:
[tex]Wavelength =\frac{c}{f}[/tex]
and c is the speed of light, and f is the frequency. Therefore, [tex]c=3x10^8m/s[/tex] and the frequncy is [tex]f=80x10^3hz[/tex]
by plugging in those values we get:
[tex]Wavelength=\frac{3x10^8m/s}{80x10^3hz} =3750m[/tex]
And so λ = 3750 meters
and 3750 meters is 3750000 millimeters