Question

At least how many thermal neutrons should be available to start a fission reaction

• A. 2
• B. 3
• C. 1
• D. 4

Answer 1

Answer: (C)

1

Most probable nuclear fission reaction is
${}_{92}^{235}U{+}_0^{1}n{\to }_{56}^{141}Ba{+}_{36}^{92}Kr+3_0^{1}n+energy$
So, atleast one thermal neutron is required to start a fission reaction.