The energy equivalent of one atomic mass unit (a.m.u) is:
Correct answer: C. 931 MeV
- A. 1.6 x 10^-19 J
- B. 1.6 x 10^19 J
- C. 931 MeV
- D. 9.31 MeV
Explanation
Atomic mass unit (a.m.u.) is a unit of mass used to express mass of atomic particles.One atomic mass unit (1 a.m.u.) is defined as one twelfth1/12 of the mass of an atom of carbon-12.1amu =1.66×10−27kgAccording to Einstein's mass-energy equivalence relation,𝐸 = (𝛥𝑚)c2So, we need to find energy equivalent of 1 a.m.u.E=(1.66×1027kg)×(3×108m/s)2=1.49×10−10joulesBut 1 MeV = 1.6×10−13JE=1.49×10−10/1.6×10−13MeV=931 MeVThus, 1 amu of mass is equivalent to 931 MeV of energy.
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