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Carbon has been(infrequently) used in nuclear reactors as a neutron moderator. Neutrons from the fissioning of...

Carbon has been(infrequently) used in nuclear reactors as a neutron moderator. Neutrons from the fissioning of a uranium nucleus are moving too fast and must be slowerd down to keep the chian reaction going. Elastic collisions between a fast neutron and a carbon atom initioally at rest will leave the neutron with a slower final speed(their speed is moderated). a. how many such elastic collisions are necessary for the neutron to reduce its speed to less than one third of its initial speed?

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