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A nucleus with mass number 220 , initial...

A nucleus with mass number 220 , initially at rest, emits an `alpha` -particle. If the `Q` value of reaction is `7.8MeV` and subsequently after the emission of `alpha` -particle, a photon of energy `1.2 MeV` is also emitted, then the kinetic energy (in MeV ) of `alpha` -particle is.

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