Question

1. Massive amounts of destructive energy are released when a nuclear fission bomb explodes. Where does that energy come from?

Answer 1

Answer: A. A chain reaction occurs when uranium atoms split, releasing nuclear energy.

Explanation: Nuclear fission reactions are those nuclear reactions in which heavier nuclei splits into two or more lighter nuclei. In these reactions, neutrons are released with a large amount of energy.

General equation for nuclear fission reactions is given by

$_{92}^{235}\textrm{U}+_0^1n\rightarrow _{98}^{236}\textrm{U}\rightarrow _{56}^{139}\textrm{Ba}+_{36}^{94}\textrm{Kr}+3_0^1n$

The released 3 neutrons further react with remaining uranium atoms and thus a chain reaction sets up.

Answer 2

The energy came from :
A.  chain reaction occurs when uranium atoms split, releasing nuclear energy.
Now, scientists used this chain reaction to produce enough  heat that is used to generate electricity.