The process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy, is .

Explanation:

A process in which a large nuclei of an atom splits into two small nuclei is known as a nuclear fission.

For example, is a nuclear fission reaction.

And, when two small nuclei combine together and result in the formation of a large nuclei then it is known as nuclear fusion.

For example, is a nuclear fusion reaction.

Thus, we can conclude that the process in which the nucleus of an atom splits into two lighter atoms, releasing a large amount of energy, is nuclear fission.

a 2,000 calorie based diet.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form