Question

Select the correct statement with
respect to the nuclear fission chain
reaction
(A) Moderator increases the energy
of neutrons so that they can be
further used for the fission
reaction.
(B) Rods of Boron or cadmium are
used to absorb the excess
neutrons produced in the fission
of Uranium nucleus so that the
reaction could be controlled.
(C) Heavy water is an isotope of
Helium can be used as coolant.
(D) All are correct
2​

Answer 1

hope it helps you....

mark me as brainliest.....

Answer 2

Lets evaluate each statement:

Explanation:

1. Moderator decreases the speed of fast moving neutrons and slows them down ,if they are too fast they are even absorbed by moderator so as to facilitate their interaction with uranium .
2. Boron or Cadmium rod is used to absorb excess neutrons produced during fission so as to control the reaction and avoiding a catastrophe.
3. Heavy water is water that contains isotope of Hydrogen as Deuterium and is used as coolant to absorb excess heat produced during nuclear reactions.