Question

What is the radius of an\({\rm{\alpha }}\) particle?

Short answer

The radius of the \({\rm{\alpha }}\) particle is obtained as: \(1.905 \times {10^{ - 15}}\,{\rm{m}}\).

Step-by-step solution

Define Radioactivity

The spontaneous emission of radiation in the form of particles or high-energy photons as a result of a nuclear process is known as radioactivity.

Evaluating the radius

The atomic mass number of the \({\rm{\alpha }}\) particle is:

\(\;A = 4\)

The radius of\({\rm{\alpha }}\)particle is:

\({R_o} = 1.2 \times {10^{ - 15}}\,{\rm{m}}\)

Using the following relation to obtain the value of radius as:

\(\begin{align}R &= \;{R_o}{A^{\frac{1}{3}}}\\ &= 1.2 \times {10^{ - 15}}\,m \times {(4)^{\frac{1}{3}}}\\ &= {\rm{ }}1.905 \times {10^{ - 15}}\,m\end{align}\)

Therefore, the radius is: \(1.905 \times {10^{ - 15}}\,{\rm{m}}\).