This page consists of solved numerical problems included in the Physics Course for grade 12.

S.No

Description of problem

Problem 1

Find the mass defect and binding energy of helium nucleus, _{2}He^{4}. See Solution

Problem 2

A certain radioactive isotope has half-life of 8 hours. A solution containing 500 million atoms of this isotope is prepared. How many atoms of this isotope have not disintegrated (a) 8 hours (b) 24 hours? See Solution

Problem 3

Write the nuclear equations for beta decay of the following;

(a)_{>82}Pb^{210} (b) _{83}Bi^{210} (c)_{90}Th^{210} (d)_{93}Np^{239} See Solution

Problem 4

Calculate the total energy released if 1 kg of U235 undergoes fission. Taking the disintegration energy per event to be Q = 208 MeV. See Solution

Problem 5

Find the energy released in the following fission reaction; _{0}n^{1} + _{92}U^{235} —–> _{36}Kr92 + _{56}Ba^{141} + 3_{0}n^{1} + Q See Solution

Problem 6

Find the energy released in the fusion reaction; _{1}H^{2} + _{1}H^{3} ———-→ _{2}He^{4} + _{0}n^{1}

_{3}Li^{6} is bombarded by deuteron. The reaction gives two α particles along with the release of energy equal to 22.3 MeV. Knowing masses of deuteron and α particles, determine mass of lithium isotope of _{3}Li^{6}.

Find the energy released in when β-decay changes _{90}Th ^{234} into _{91}Pa^{234}. Mass of _{90}Th ^{234} = 234.0436 u and _{91}Pa^{234} = 234.042762 u.

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