The nucleus of the polonium isotope 214po mass 214u is, Ask an Expert

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The nucleus of the polonium isotope 214^po (mass 214u ) is radioactive and decays by emitting an alpha particle (a helium nucleus with mass 4u ). Laboratory experiments measure the speed of the alpha particle to be 1.60×10^7m/s.

Assuming the polonium nucleus was initially at rest, what is the recoil speed of the nucleus that remains after the decay?

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