What energy must be added or given off in a reaction where two hydrogen atoms and two neutrons are combined to form a helium atom? (Atomic masses for each: hydrogen, 1.007 825 u; neutron, 1.008 665 u; helium, 4.002 602 u; also, 1 u = 931.5 MeV/c2)

a. 74.85 MeV added
b. 74.85 MeV given off
c. 28.30 MeV given off
d. 28.30 MeV added


c

Physics & Space Science

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