But Salam, a practicing Muslim and one of the physicists to mathematically unify two of the fundamental forces of nature — electromagnetism and the weak force, which
governs radioactivity — identified with Polkinghorne's quest.
This model describes three types of forces: electromagnetic interactions, which cause all phenomena associated with electric and magnetic fields and the spectrum of electromagnetic radiation; strong interactions, which bind atomic nuclei; and the weak nuclear force, which
governs beta decay — a form of natural
radioactivity — and hydrogen fusion, the source of the sun's energy.