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A nucleus X, initially at rest, decays i...

A nucleus `X`, initially at rest, decays into a nucleus `Y` with the emission of an `alpha` -particle'and energy `Q` is released. If `m` is mass of `alpha` -particle and `M` that of rucleus `Y`, the energy of the emitted `alpha` -particle is given by `E_(alpha)=(Q M)/(M+x m) .` Find the value of `x`.

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