Question 19N.2.SL.TZ0.b(ii)

states or applies conservation of momentum ✔

ratio is «$\frac{E_{\mathrm{k}\alpha }}{E_{\mathrm{kTh}}}=\frac{{\displaystyle \frac{p^2}{2m_{\alpha }}}}{{\displaystyle \frac{p^2}{2m_{\mathrm{Th}}}}}=\frac{234}{4}$» 58.5 ✔

NOTE: Award [2] for bald correct answer