Answer
$K_\alpha=3.541 \mathrm{MeV}$
Work Step by Step
$
K_\alpha=\frac{Q}{1+\left(m_\alpha / m_{\mathrm{n}}\right)}\\=\frac{17.59 \mathrm{MeV}}{1+(4.0015 \mathrm{u} / 1.008665 \mathrm{u})}\\=3.541 \mathrm{MeV}
$
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