Heavy water is used as a moderator in a nucle | vedclass

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(D) In a nuclear reactor,fission reactions produce fast-moving neutrons. These fast neutrons have a low probability of causing further fission in $U^{

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To slow down the neutrons to thermal energies

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(D) In a nuclear reactor,fission reactions produce fast-moving neutrons. These fast neutrons have a low probability of causing further fission in $U^{235}$. The function of the moderator (like heavy water,$D_2O$,or graphite) is to collide with these fast neutrons,thereby reducing their kinetic energy through elastic collisions until they reach thermal energies (approximately $0.025 \ eV$). These slow or 'thermal' neutrons are much more effective at inducing fission in $U^{235}$,thus sustaining the chain reaction.

Column-$A$	Column-$B$
$A$. Rocket propulsion	$P$. Bernoulli's principle in fluid dynamics
$B$. Aeroplane	$Q$. Total internal reflection of light
$C$. Optical fibres	$R$. Newton's laws of motion
$D$. Fusion test reactor	$S$. Magnetic confinement of plasma
	$T$. Photoelectric effect

Heavy water is used as a moderator in a nuclear reactor. The function of the moderator is

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