A ${\pi ^0}$ at rest decays into $2\gamma $ rays ${\pi ^0} \to \gamma + \gamma $. Then which of the following can happen
A ${\pi ^0}$ at rest decays into $2\gamma $ rays ${\pi ^0} \to \gamma + \gamma $. Then which of the following can happen
- 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
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- [NEET 2016]