question_answer

A \[{{\pi }^{0}}\] at rest decays into \[2\gamma \] rays \[{{\pi }^{0}}\to \gamma +\gamma \]. Then which of the following can happen  [CPMT 2002]

A)            The two \[\gamma 's\] move in same direction

B)            The two \[\gamma 's\] move in opposite direction

C)            Both repel each other

D)            Both attract each other