Most radiation exposure comes from natural sources. These so-called "natural sources" include Radon, Internal, Terrestrial, and Cosmic. Among that, Radon proves to be the largest source of radiation. Radon is a naturally occurring radioactive gas that comes from the breakdown of uranium.
The work function is what we call the minimum energy that is required by an electron to leave the metal target in the photoelectric effect.
Answer:
D is the answer wave behavior
D or b you chose because it can go any way
