Question

The rays exhibit maximum penetration power.

• A. alpha
• B. beta
• C. gamma

Answer 1

The correct option is C gamma

The penetrating power of nuclear radiation depends upon the ionising power of the radiation.

Alpha particles are strongly ionising but can be stopped by paper or skin.

Beta particles are fast electrons. Among the three, they have medium ionizing ability and medium penetration depth.

Gamma rays are very poor at ionising, but they have very high penetration as compared to alpha and beta.

So, the correct order is $\gamma$ > $\beta$ > $\alpha$.