Chapter 30, Problem 5P

To determine

The mass of alpha particle without electron.

Answer to Problem 5P

Solution:

$M_{\alpha }=3726.841MeV/c^2$

Explanation of Solution

Alpha particle consists of two neutrons and two electrons.

Mass of alpha particle is given by,

$\begin{array}{l}{M}_{\alpha }=M_{He}-M_e\\ M_{\alpha }=(4.002)(931.5)MeV/c^2-2(0.511)MeV/c^2\\ M_{\alpha }=3726.841MeV/c^2\end{array}$