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Question 7 Sam leaves Venus in a spaceship headed to Mars and passes Sally, who is on Earth, with a relative speed of 0.5c. (a) Each measures the Venus-Mars voyage time. Who measures a proper time: Sam, Sally, or neither? (b) On the way, Sam sends a pulse of light to Mars. Each measures the travel time of the pulse. Who measures a proper time? 1. Sam 2. Sally 3. Neither 4. Both

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Answer #1

(a) Sam measures the proper time because both departure from Venus and arrival at Mars occurs at the same location in Sam's reference frame (spaceship).

(b) Neither measures the proper time as leaving of pulse from Sam's spaceship and arrival at Mars both events occur at different locations in the frame of reference of both Sam and Sally.

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