Question

The charge on alpha particles is

• A. $4.8\times {10}^{-19}C$
• B. $1.6\times {10}^{-19}C$
• C. $3.2\times {10}^{-19}C$
• D. $6.4\times {10}^{-19}C$

Answer 1

The correct option is C

$3.2\times {10}^{-19}C$

Solution:

1. Let the charge on an alpha particle be $q$. As an Alpha particle is similar to the nucleus of helium,
2. Thus, it will have two protons as the atomic number of helium is $2$. The charge of a proton is $1.6\times {10}^{-19}$. Now, we can say that

$$\begin{gathered} q=2e \\ =2\times 1.6\times {10}^{-19} \\ =3.2\times {10}^{-19}C \end{gathered}$$

Hence, option C is the correct option.