Answer:
D. 4000 km
Explanation:
f = Frequency of wave that is being transmitted = 76 Hz
[tex]\lambda[/tex] = Wavelength of wave that is being transmitted
v = The velocity of electromagnetic waves through air = [tex]3\times 10^8\ m/s[/tex]
Velocity of a wave is given by
[tex]v=f\lambda\\\Rightarrow \lambda=\frac{v}{f}\\\Rightarrow \lambda=\frac{3\times 10^8}{76}\\\Rightarrow \lambda=3947368.42105\ m=3947.36842105 km\approx 4000\ km[/tex]
Hence, the approximate wavelength of the waves is 4000 km
