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What MeV in MeV photon signify

What does MeV in MeV photon signify? Briefly describe it.

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The MeV signifies million electron volts. It is a measure of energy that is, the energy in the photon, which is a quantum or specific quantity of the electromagnetic energy.

1 mega electron volt = 1.60217646 × 10-13 joules of energy.

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