Suppose we carefully synchronize two identical atomic clocks initially standing next to each other (call them $A$ and $B$ ). We put clock $B$ on a jet plane, which then flies around the world at an essentially constant speed of $300 \mathrm{~m} / \mathrm{s}$, returning $134,000 \mathrm{~s}(37.1 \mathrm{~h})$ later. We then again compare the two clocks. Assume the earth's surface defines an inertial reference frame, and ignore the possible effects of gravity.
-(b) Which clock measures a coordinate time between the synchronization and comparison events?
A) Clock $A$
B) Clock $B$
C) Both
D) Neither

Question

Quizplus · Accepted Answer

Clock A measures the coordinate time between the synchronization and comparison events because it remains in the inertial reference frame defined by the Earth's surface, while clock B is moving and thus experiences time dilation according to the theory of relativity.

Suppose We Carefully Synchronize Two Identical Atomic Clocks Initially Standing AAA

Suppose We Carefully Synchronize Two Identical Atomic Clocks Initially Standing $A$