Changes and radiation

Question 1

Why is nuclear radiation emitted?

Answer 1

Energy is emitted from the nuclei of unstable atoms. Protons and neutrons also occupy energy levels in the nucleus, in the same way that electrons do in the atom. When energy changes occur in the nucleus, high-energy gamma rays are emitted. Gamma rays can be emitted over a large range of frequencies, depending on the energy levels within the nucleus.

Question 2

Explain the energy changes that concur within the electron levels of the atom?

Answer 2

Electrons can move between energy levels if they absorb or emit electromagnetic radiation. When they absorb electromagnetic radiation, they move up energy levels, and when they emit electromagnetic radiation, they move down energy levels.