The video tutorial covers Thompson's atomic model, describing it as a spherical atom with a positive charge background and electrons spread like watermelon seeds, making the atom neutral. It then introduces radioactivity, explaining that certain elements emit radiations like alpha, beta, and gamma rays. Uranium is highlighted as a radioactive element, emitting these three types of radiation. Alpha rays have low penetration, while gamma rays have high penetration power.

Describe the differences between alpha rays, beta rays, and gamma rays.

What is the significance of the penetrating power of gamma rays compared to alpha and beta rays?