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Question Number 21412 by Tinkutara last updated on 23/Sep/17

$$\mathrm{The}\mathrm{atomic}\mathrm{masses}\mathrm{of}{}^{\prime }{\mathrm{He}}^{\prime }\mathrm{and}{}^{\prime }{\mathrm{Ne}}^{\prime }\mathrm{are}$$$$4\mathrm{and}20\mathrm{a}.\mathrm{m}.\mathrm{u}.,\mathrm{respectively}.\mathrm{The}$$$$\mathrm{value}\mathrm{of}\mathrm{the}\mathrm{de}\mathrm{Broglie}\mathrm{wavelength}\mathrm{of}$$$${}^{\prime }{\mathrm{He}}^{\prime }\mathrm{gas}\mathrm{at}-73°\mathrm{C}\mathrm{is}‘‘{\mathrm{M}}^{″}\mathrm{times}\mathrm{that}\mathrm{of}$$$$\mathrm{the}\mathrm{de}\mathrm{Broglie}\mathrm{wavelength}\mathrm{of}{}^{\prime }{\mathrm{Ne}}^{\prime }\mathrm{at}$$$$727°\mathrm{C}{}^{\prime }{\mathrm{M}}^{\prime }\mathrm{is}$$

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