Question

which of the following would cause the least harm to a person?
x - rays
ultraviolet light
microwaves
gamma rays

Explanation:

Among x - rays, ultraviolet light, microwaves, and gamma rays, microwaves have the lowest energy and longest wavelength in this set. Lower - energy electromagnetic radiation generally causes less harm to human tissue. X - rays, ultraviolet light, and gamma rays can cause ionization and damage to cells and DNA, while microwaves mainly cause heating effects which are less harmful in normal exposure scenarios.

Answer:

C. microwaves