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Question:

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)

2.67 MeV

26.7 MeV

13.35 MeV

6.675 MeV

Solution:

Energy liberated = mass defect × 931 MeV
Energy liberated = 0.02866 u × 931 MeV/u
Energy liberated = 26.7 MeV