12. Explain the theory of alpha particle etumstum
selection rule for alpha decay.
\[
(2 \times 5=10 \text { weightage })
\]
Section C
Answer any four questions.
Each question carries weightage 3.
13. From the known masses of \( { }^{15} \mathrm{O} \) and \( { }^{15} \mathrm{~N} \), compute the difference in binding energy. Assuming this difference to arise from the difference in coulomb energy, Compute the nuclear radius of \( { }^{150} \mathrm{O} \) and \( { }^{15 N} \). (Mass of proton \( =1.00727647 \) a.m.u., Mass of neutron \( =1.0086654 \mathrm{a} . \mathrm{m} . \mathrm{u} . \mathrm{2} \). Mass of \( { }^{15} \mathrm{O}=15.0030654 \mathrm{a} . \mathrm{m} . \mathrm{u} \). Mass of \( { }^{15} \mathrm{~N}=15.004890 \) a.m.u)
14. Show that the mixing of \( S \) and \( D \) states accounts for the magnetic moment of the deuteron?
15. Discuss about the classical electromagnetic radiation.
16. Discuss the theory of controlled fission reactions.
17. Explain what are single channel and multichannel analyser.
18. Illustrate with an example the conservation laws obeyed in elementary particle reaction.
19. Distinguish between Leptons and Hadrons.
\[
(4 \times 3=12 \text { weightage })
\]
\[
\left(\frac{n-1}{2}\right)=I
\]
