At What Speed Would an Astronaut Need to Travel So

question 42

Multiple Choice

At what speed would an astronaut need to travel so that he would age 4.20 years while traveling a distance (as measured by an Earth observer) of 4.20 ly?

• A) 1.00 c
• B) This cannot be done.
• C) 0.50 c
• D) 0.707 c
• E) 0.750 c

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