Question

When $U-235$ is fissioned in a nuclear reactor, the nuclear reaction is maintained by

• A. heat produced in the reactor
• B. the moderator rods
• C. radioactive decay products
• D. vibration induced in the $U-235$
• E. neutrons produced in the reaction

Answer 1

The correct option is E neutrons produced in the reaction

The nuclear reaction of $U^{235}$ is ,

${}_{92}{U}^{235}{+}_0{n}^1{⟶}_{56}B{a}^{141}{+}_{36}K{r}^{92}+3_0{n}^1+Q$

in each fission reaction , three more neutrons are produced.The three neutrons ,cause the fission of other three uranium nuclei , producing 9 neutrons and so on.Therefore , neutrons produced in the reaction are maintaining the reaction.