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Help with my physics homework please

  1. Nov 5, 2008 #1
    1. The problem statement, all variables and given/known data
    How long would it take a radio wave whose frequency is 7.25 x 10^5 Hz to travel from mars to Earth if the distance between the two planets is approximately 8.00 x 10^7 km.

    2. Relevant equations

    Don't know what to put here.

    3. The attempt at a solution
    7.25 x 10^5 / 8.00 10^9=9.0625 x 10^-5
    Is that they right answer or am i doing this whole thing the wrong way?
  2. jcsd
  3. Nov 5, 2008 #2


    User Avatar

    Staff: Mentor

    Hint: The frequency of the radio wave is irrelevant in this question. What is the velocity of propagation of light (and hence radio waves) in a vacuum?
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