How Does Altitude Affect the Frequency of a 1GHz Signal from a Satellite?

[kingyof2thejring]

Homework Statement

sky tv is broadcast from a satellite in orbit at an altitude of 35600km. By considering the defference between the satellite and the surface of the Earth , find the frequency shift of a 1GHz signal broadcast to the earth.
(i have been given radius and mass of the earth.

Homework Equations

g=Gm/r^2, f(observed)=f(emit){1 +/- gh/c^2}

The Attempt at a Solution

find g
f(emitted)=1GHz
how do i calculate f(observed)?

 

[paaghi]

(G*M) / (r * c^2) = (wo - we) / we

"wo" is the wavelength of the photon as measured by a distant observer.
"we" is the wavelength of the photon when measured at the source of emission.
and "r" is distance

w = c / f (c=speed of light)----------------
Pooya Afaghi