3. What kind of photon is required for the pair production phenomenon to occur?
a) Visible Light Photon
b) X-ray Photon
C) y-ray Photon
d) UV Photon
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Explanation: When a γ-ray Photon passes close to an atomic nucleus (b < R) and it possesses energy greater than 1.02 MeV, the photon is converted into electron-positron pair. This is called pair production.
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