NEET Physics Nuclei Questions Solved

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If an electron and a positron annihiliate, then the energy released is 
(a) 3.2×10-13 J        (b) 1.6×10-13 J
(c) 4.8×10-13 J           (d)  6.4×10-13 J

(b) Mass of electron = mass of positron = 9.1×10-31kg
Energy released E=(2m)c2
2×9.1×10-31×(3×108)2=1.6×10-13 J

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