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For pair production i.e. for the product...

For pair production i.e. for the production of electron and positron, the incident photon must have a minimum frequency of the order of

A

`10^(18) s^(-1)`

B

`10^(21) s^(-1)`

C

`10^(25) s^(-1)`

D

`10^(30) s^(-1)`

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The correct Answer is:
B
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