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Homework Help: Measurement of Time

  1. Dec 23, 2011 #1

    In communicating with an astronaut on the moon, 3.8x10^8 m from earth, what is the minimum time delay in getting a response to a question?

    The answer in the book is given as 2.5 seconds.

    Have they simply used;

    ( (3.8x10^8) / c ) x 2
    Last edited: Dec 23, 2011
  2. jcsd
  3. Dec 23, 2011 #2
    Yes, i assume they have used ( (3.8x10^8) / c ) x 2 to get the distance from Earth to Moon and then back, then they have divided by speed of light.
  4. Dec 23, 2011 #3
    Thank you
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