A neutron makes a head-on elastic collision with a stationary deuteron. The fractional energy loss of the neutron in the collision is

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answer is B.

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Detailed Solution

Fractional decrease in kinetic energy of neutron=1−m1−m2m1+m22 [As m1=1 and m2 = 2] =1−1−21+22=1−132=1−19=89

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