Modern Physics

Electronic emmision, thermionic emission, diode valve and Gieger count

Radioactive Elements

The elements that emit highly penetrating and high energy radiation beam are known as radioactive elements. The elements are subjected to spontaneous degeneration of nucleus along with the emission of radiations. Elements with the atomic number greater than 83 are considered as radioactive and some naturally occurring radioactive elements include uranium, radium and thorium.

Becquerel Rays

Becquerel rays are radiations given out by radioactive elements.

Properties:

• They are gas ionizers.

• They affect photographic plate.

• They can penetrate through matter.

• They are affected by electric and magnetic fields.

Experiment to demonstrate the pr…