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Calculating speeds of radio to a planet

  1. Sep 21, 2010 #1
    Hi! I need help with the method to approach a question, if I wish to calculate how long it will take for a radio message to reach a certain planet (just the general concept), what will be the key pieces of information I require?

    I know I need: the distance from Earth to said planet
    the distance travelled by the radio message (speed of light x journey time)

    What else would I require? Any help is appreciated on this question. Thank you.
     
  2. jcsd
  3. Sep 21, 2010 #2

    Redbelly98

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    The distance traveled is enough information to calculate the journey time.
     
  4. Sep 21, 2010 #3

    russ_watters

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    Well, that and the speed of light, but you can look that up. :wink:
     
  5. Sep 21, 2010 #4

    Redbelly98

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    Well, yeah. There's also a good chance you'll need to know how to convert units.
     
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