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KCET2012PhysicsNuclear Physics

Mass number of the elements A, B, C and D are 30,60,90 and 120 respectively. The specific binding energy of them are 5 MeV , 8.5 MeV , 8 MeV and 7 MeV respectively. Then, in which of the following reaction/s energy is released? 1. D 2 ~B 2. C B + A 3. B 2 ~A

Options

  1. Ain (1), (2) and (3)
  2. BOnly in (1)
  3. Cin (2), (3)
  4. Din (1), (3)

Correct answer

B. Only in (1)

Step-by-step solution

(1) E =2 60 8.5-120 7=180 MeV (2) E =60 8.5+30 5-90 8=-60 MeV (3) E =2 30 5-60 8.5=-105 MeV Hence, energy is released in (1) only. So, option (b) is correct.

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