Fast neutrons may most easily be slowed down by which one of the following methods? (A) passing ...

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Fast neutrons may most easily be slowed down by which one of the following methods?
(A) passing them through a substance rich in hydrogen
\( P \)
(B) allowing them to collide elastically with heavy nuclei
W.
(C) using lead shielding
(D) passing them through an increasing potential gradient space
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