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

According to the theory of relativity, time dilation occurs for observers in different inertial frames. Observers in other frames will measure a longer time interval (more than Δt) between the astronaut's heartbeats due to her relative motion.

An Astronaut in an Inertial Reference Frame Measures a Time