Question

The most penetrating component of radioactive radiation are the ___________ rays.

Answer 1

1. As the size of the particle increases its penetration power decreases.
2. Alpha($\alpha$) particles are bigger in size followed by beta ($\beta$) and gamma($\gamma$).
3. So, gamma($\gamma$) rays are the most penetrating component of radioactive radiation.

Hence, the most penetrating component of radioactive radiation are the gamma($\gamma$) rays.