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-   -   Gravitional frequency effect (http://www.physicsforums.com/showthread.php?t=147171)

 kingyof2thejring Dec7-06 03:04 PM

gravitional frequency effect

1. The problem statement, all variables and given/known data
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.

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

3. The attempt at a solution
find g
f(emitted)=1GHz
how do i calculate f(observed)?

 paaghi Dec7-06 05:11 PM

(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

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