Giải thích hộ mình câu sau Vì sao 1 u = 931,5 MeV/ $c^{2}$

Đáp án:

$\Delta E=\Delta m.c^2$ 

Khi $\Delta m=1kg; c=2,9979.10^8 m/s$ thì $\Delta E=8,9874.10^{16} kg.m/s=8,9874.10^{16} J$

$\Rightarrow 1kg=8,9874.10^{16} J/c^2$ 

$\Rightarrow \dfrac{1}{1,6605.10^{-27}}u=8,9874.10^{16} J/c^2$

$\Rightarrow 1u=1,492358.10^{-10} J/c^2$ 

Ta có $1MeV=10^6 eV=10^6.1,602.10^{-19}J$ 

$\Rightarrow 1u=\dfrac{1,492358.10^{-10}}{10^6.1,602.10^{-19}} MeV/c^2=931,5 MeV/c^2$