If mass of an atom is $M$ moving with speed $v$, what will be its speed after the emission of an $\alpha$-particle if speed of $\alpha$-particle is zero ?

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Aicharya · Accepted Answer

Applying the principle of momentum conservation, $\begin{aligned} M v & =(M-4) v^{\prime} \quad\left[\begin{array}{r} \because 	ext { the speed of the } \ 	ext { a-particle is zero }] \end{array}ight. \ \Rightarrow \quad v^{\prime} & =\frac{M v}{M-4} \end{aligned}$

If mass of an atom is $M$ moving with speed $v$, what will be its speed after the emission of an…

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