Fragments produced on the fission of `U^235` are radioactive.
The fragments have abnormally high proton to neuton ratio.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

C

Explanation

( c) Fragments produced in the fission of `U^235` are radioactive. When uranium undergoes fission, barium and krypton are not the only products. Over `100` different isotopes of more than `20` different elements have been detected among fission products. All of these atoms are, however, in the middle of the periodic table, with atomic numbers ranging from `34` to `58`. Because the neutron-proton ratio needed for stability in this is much smaller than that of the orginal uranium nucleus, the residual nuclei called fission fragments, always have too many neutrons for stability. A few free neutrons are liberated during fission and the fission fragments undergo a series of beta decays(each of which increases `Z` by one and decreases `N` by one) until a stable nucleus is reached. During decay of the fission fragments, an average of `15 MeV` of additional energy is liberated.