•Something
that “radiates”, or spreads out in “rays”
•
•High speed particles (eg. high speed neutrons ejected from a disintegrating atomic nucleus)
•
•Electromagnetic
radiation:
–Towards
shorter “wavelength” and higher energy:
•Visible
light, Ultraviolet light, X-Rays, Gamma-Rays
–Towards
longer “wavelength” and lower energy:
•Visible
light, Infrared radiation, microwaves, radio waves