[Solved] An Astronaut in an Inertial Reference Frame Measures a Time

Question 3
Multiple Choice

An astronaut in an inertial reference frame measures a time interval Δt between her heartbeats. What will observers in all other inertial reference frames measure for the time interval between her heartbeats?

A) Δt
B) more than Δt
C) less than Δt
D) The answer depends on whether they are moving toward her or away from her.

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