Many nuclear reactors use heavy water moderators in which


Many nuclear reactors use heavy water moderators in which elastic collisions occur between neutrons and deuterons of mass 2.0 u.

(a) What is the speed of a neutron, expressed as a fraction of its original speed, after a head-on, elastic collision with a deuteron that is initially at rest?

(b) What is its kinetic energy, expressed as a fraction of the initial value?

(c) How many successive collisions will reduce the speed of a neutron to 1/59,000 of its original value?

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Physics: Many nuclear reactors use heavy water moderators in which
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