PhysicsJEE Main 5 Apr 2026, Shift 2·Q19·MCQ·Easy–moderate

Nuclei · Nuclear structure

Assuming the experimental mass of

{}^{12}_{6}\mathrm{C}

nucleus as 12u, the mass defect of

{}^{12}_{6}\mathrm{C}

nucleus is

\mathrm{MeV/c^2}

. (Mass of proton

= 1.00727

u. mass of neutron

= 1.00866

u, 1 u

= 931.5\ \mathrm{MeV/c^2}

and c is the speed of the light in vacuum.)

(1)127.5
(2)89.03
(3)272.0
(4)92.0

We corrected a printing error in the original paper

Source printed “experimental mass of ${}^{12}_{6}$ C as 12u, the mass defect of ${}^{12}_{6}$ C atom”; corrected to the intended “ ${}^{12}_{6}$ C nucleus” in both places (the data give proton, not hydrogen-atom, masses and no electron mass; the key 89.03 is the nuclear defect).

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Nuclei · Nuclear structure

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