A spaceship is traveling away from Earth at 0.70c. The astronauts report home by radio every 4.0

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A spaceship is traveling away from Earth at 0.70c. The astronauts report home by radio every 4.0 h (by their own clocks). 

(a) At what interval are the reports sent to Earth, according to Earth clocks? 

(b) At what interval are the reports received by Earth observers, according to their own clocks?

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