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1900's Physics and Wave

In pair annih...

Question

In pair annihilation the least number of $γ$ - ray photons produced is :

A

2

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B

3

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C

4

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D

1

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Solution

The correct option is A 2
In a pair annihilation, atleast two gamma rays must be produced. For example, when an electron encounters a positron, they annihilate to produce two gamma rays each having $0.511$ MeV energy.

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