Time dilation: 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 thanΔt
C) less than Δt
D) The answer depends on whether they are moving toward her or away from her.

Question

Quizplus · Accepted Answer

Observers in all other inertial reference frames moving relative to the astronaut will measure the time interval between her heartbeats to be more than Δt due to time dilation effects predicted by the theory of relativity.

Time Dilation: an Astronaut in an Inertial Reference Frame Measures