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Homework Help: Travel time of light in gravity field of sun.

  1. Mar 27, 2012 #1
    1. The problem statement, all variables and given/known data
    Given the distance from the sun to earth xE, the distance from the sun to venus xV and the mass of the sun m calculate the time delay due to gravity in receiving a radio signal sent from earth to venus (and reflected back). Ignore the gravity fields of venus and earth. Venus lies directly between Earth and Sun!

    2. Relevant equations

    from lectures:

    [itex]t' = (1 + \frac{\Delta\phi}{c^{2}}) t[/itex]

    [itex]\Delta\phi = \frac{-Gm}{r}[/itex]

    3. The attempt at a solution

    proper time as recorded by distant observer =
    [itex] t_{0} = \frac{x_{E}-x_{V}}{c}[/itex],
    this is the time for a one way trip from Earth to Venus.

    I think that the time delay is caused by the slowing of time due to change in grav. potential but I don't know how to calculate this.

    This isn't homework just self study, thanks
    Last edited: Mar 27, 2012
  2. jcsd
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