Think about three kinds of electromagnetic radiation with lower frequency and energy than visible light: infrared waves, microwaves, and radio waves. What other sources of this radiation have you heard about? What questions do you have about these sources of radiation?

Radio waves have photons with low energies, microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and, the most energetic of all, gamma-rays.

Explanation:

14 days is the half-life of phosphorus-32

he would use the colour black