H4

The Twin Paradox:
There are 2 identical twins named Anantha and Ahtnana.
Anantha sees Ahtnana's clock tick more slowly than her own, so he things that Ahtnana is ageing more slowly than Ahtnana is. Anantha therefore expects that when Ahtnana returns,Ahtnana will be the younger. 


Ahtnana sees Anantha's clock tick more slowly than her own so thinks a is aging more slowly. B therefore expects that Anantha will be younger when he returns.
The Paradox is that they cannot both be the younger one out of the two.


So who is actually the youngest?
Since Ahtnana had to accelerate when he started, when he turned around to come home, and when she stopped at the end. Ahtnana is therefore in a non-inertial frame of reference, so the problem can't be solved with special relativity. General Relativity shows that during acceleration, clocks also tick slowly so B will in fact be the younger out of the 2.


What was Developed to satisfy the Twin Paradox?
The General Theory of Relativity was invented and it satisfied the Paradox as the General Theory took non-inertial frames of reference into account and is able to deal with them.


Hafele-Keating Experiment:

Question 7,8 and 9: