28-5 Test-Style Multiple Choice Question: Consider the twin paradox. I take two identical twins. One stays on the Earth while another goes on a trip into space, eventually returning to Earth. From the reference frame of the twin on Earth, the time between ticks on the traveling twin's watch is longer than one second, the traveling twin's heart beats slower, and the traveling twin doesn't age as fast. So when the two meet up at the end of the journey, the traveling twin will be younger than the Earth-bound twin. But in the reference frame of the traveling twin, it is the Earth-bound twin that is moving, so shouldn't the Earth-bound twin end up as the younger twin? Any good physicist will tell you that there is no paradox - it will indeed be the traveling twin who ends up younger. Why do we use the Earth-bound twin's reference frame rather than the traveling twin's frame?
A. It is a simple matter of convention - absolute age has no meaning.
B. The Earth-bound twin's frame is not an inertial frame.
C. The traveling twin's frame is not an inertial frame.
D. The Earth-bound twin's velocity is small.
E. The traveling twin's velocity is large.
F. Time is relative.