Electromagnetic radiation or electromagnetic waves are created due to periodic change of electric or magnetic field. Depending on how this periodic change occurs and the power generated, different ...

We say that it becomes ‘excited’. An electron can be excited when its absorbs energy from electromagnetic radiation. Different changes in energy level need different frequencies of ...

high energy electromagnetic radiation emitted from unstable nuclei. It is normally emitted alongside alpha or beta radiation. Gamma ray emission causes no change in the number of particles in the ...