A hydrogen atom is in the $4^{\mathrm{th}}$ excited state, then:

The radionuclide ${}^{238}\mathrm{U}$ decays by emitting an alpha particle.
${}^{238}\mathrm{U}\to {}^{234}\mathrm{Th}+{}^4\mathrm{He}$
The atomic masses of the three isotopes are.
${}^{238}\mathrm{U} 238.05079\mathrm{amu}$

${}^{234}\mathrm{U} 234.04363 \mathrm{amu}$

${}^4\mathrm{He} 4.00260 \mathrm{amu}$
What is the maximum kinetic energy of the emitted alpha particle? Express your answer in Joule. $\left(1\mathrm{amu}=1.67\times {10}^{-27} \mathrm{kg}\right)$