Fast neutrons can easily be slowed down by (a) the use of lead shielding \( \mathrm{P} \) (b) pa...

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Fast neutrons can easily be slowed down by
(a) the use of lead shielding
\( \mathrm{P} \)
(b) passing them through water
W
(c) elastic collisions with heavy nuclei
(d) applying a strong electric field.
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