A nucleus at rest decays by emitting at ...

A nucleus at rest decays by emitting at `alpha` particle. The de-Broglie wavelenght of emitted `alpha` particle is `lambda=-5.76` femtometer. Mass of the daughter nucleus and `alpha` particle is 223.610u and 4.002u. Find the mass of the parent nucleus.

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The correct Answer is:

227.62u

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