Which of the following forms of electromagnetic waves is least dangerous to the human body?

question 29 options:

a. gamma rays

b. ultraviolet rays

c. microwaves

d. x-rays

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Which of the following correctly describes what happens when an atomic bomb explodes? small pieces of fissionable material are joined and form a body with a mass greater than the critical mass, the relative number of neutrons escaping decreases, and a chain reaction and explosion result. large pieces of fissionable matter are brought together quickly and form a body with a mass smaller than the critical mass, the relative number of escaping neutrons increases, and a chain reaction and explosion result.