The greatest problem facing the use of nuclear power plants is:

1) Accidents in the nuclear plants

2) Disposal of waste materials released from this power plants.

Explanation:

The use of nuclear power plant is quite efficient, but it contains radioactive elements that are highly radioactive and there occurs continuous emission of radiations that are harmful for health. There is no release of any green house gas and fossil fuels are not burnt.

The problems associated with the use of nuclear power plant are as follow-

i need the answer to this too but idk it ; -;

the answer is b, have negligible mass