Q213 · Practice questionComplex familiar1 mark
QUESTION 213
A traveller completes two equal inertial legs at speed relative to Earth, returning to Earth. The traveller's clock advances by years on each leg. Neglect the duration of acceleration at departure, turnaround and arrival. How much time elapses on Earth?
(A)
years
(B)
years
(C)
years
(D)
years
WORKED SOLUTION
1 markAnswer B
ANSWER
B. years
Worked solution
Each traveller interval is a proper time interval. , so Earth measures years per leg and years total. The turnaround breaks the equivalence of the complete journeys.
Equivalent physically justified methods and consistent equivalent units accepted.
Displayed decimals are model answers; accept appropriate significant figures and consistent rounding from stated constants.
Select B.
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