One atomic mass unit (u) is equivalent to an energy of:(a) 931 eV (b) 9.31 MeV (c) 1 MeV (d) 931 MeV

One atomic mass unit (u or amu) is used for measuring the atomic mass of particles, and it is defined as one-twelfth $(\frac{1}{12})$ of the mass of an unbonded Carbon -12, which is equal to 1.66053892 × 10^-27kg.

Einstein's famous equation, E = mc² relates energy and mass and gives One atomic mass unit equivalent to an energy of 931 MeV.