2. A "quark" (mass \( =m_{p} / 3 \) ) is confined in a cubical box with sides of length 2 fermis \( =2 \times 10^{-15} \mathrm{~m} \). Find the excitation energy from the ground state to the first excited state in \( \mathrm{MeV} \cdot\left(m_{p}=938 \mathrm{MeV} / \mathrm{c}^{2}\right) \).
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