question_answer

Calculate the energy equivalent (in \[\mathbf{Me V}\]) of one twelfth of the mass of one atom of carbon 12.                                                

Answer:

                Mass of one atom of \[^{12}C\]                 \[12\text{amu}=12\times 1.66\times {{10}^{-27}}\text{kg}\] Energy equivalent of this mass is \[E=m{{c}^{2}}=12\times 1.66\times {{10}^{-27}}\times {{(3\times {{10}^{8}})}^{2}}J\]    \[=\frac{12\times 1.66\times 9\times {{10}^{-11}}}{1.6\times {{10}^{-13}}}\text{ MeV}\] \[\mathbf{=11205MeV}\]