$γ$ -ray photon of following energy undergoes pair production :
a) $0.85 M e v$ b) $1.00 M e v$
c) $1.02 M e v$ d) $1.82 M e v$

a,b

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c,d

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b,c,d

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only d

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Solution

The correct option is C c,d
The pair production becomes possible with gamma energies exceeding $1.02 M e V$ , and becomes important as an absorption mechanism at energies over $5 M e V$ .

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