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Nuclei

JEE Main 2024 (Online) 29th January Morning ShiftMCQMedium📈 Topic in 26% papers+4−1
Ques. 1JEE Main 2024, 29 January (Morning Shift)

The explosive in a Hydrogen bomb is a mixture of 1H2, 1H3 and 3Li6 in some condensed form. The chain reaction is given by 3Li6+0n1 2He4+1H3 1H2+1H3 2He4+0n1 During the explosion the energy released is approximately [Given ; M(Li)=6.01690 amu, M (1H2 )=2.01471 amu, M (2He4 )=4.00388 amu, and 1 amu=931.5 MeV]

  1. 22.22 MeV
  2. 28.12 MeV
  3. 16.48 MeV
  4. 12.64 MeV

Answer

(1) 22.22 MeV

Solution

Add the two reactions (0n1 and 1H3 cancel):

3Li6+1H2 2 2He4

m=6.01690+2.01471-2 4.00388

=8.03161-8.00776=0.02385 amu

Q=0.02385 931.5 22.22 MeV

Answer: (1)

Keep practising — Nuclei

Ques. 2JEE Main 2024, 27 January (Morning Shift)

In a nuclear fission process, a high mass nuclide (A 236) with binding energy 7.6 MeV/Nucleon dissociated into middle mass nuclides (A 118), having binding energy of 8.6 MeV/Nucleon. The energy released in the process would be MeV.

Ques. 3JEE Main 2024, 27 January (Evening Shift)

The atomic mass of 6C12 is 12.000000 u and that of 6C13 is 13.003354 u. The required energy to remove a neutron from 6C13, if mass of neutron is 1.008665 u, will be :

  1. 62.5 MeV
  2. 6.25 MeV
  3. 4.95 MeV
  4. 49.5 MeV

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