Question

The $\alpha -$particles source are kept in lead shield in $\alpha -$particles scattering experiment because -

• A. it is big in size.
• B. it is radioactive in nature.
• C. it is light.
• D. None of these

Answer 1

The correct option is B it is radioactive in nature.

Alpha particles come from the decay of the heaviest radioactive elements, such as uranium, radium and polonium.

Therefore, for protection purposes, they are kept inside the lead shield.

Hence, option $\left(B\right)$ is the correct answer.