Energy levels (Question 1 (5 Marks)) — UPSC Physics Optional CSE 2015 Paper II
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The energy levels of a hydrogen atom are given by E_n = \left(\frac{-1}{n^2}\right)R_{\mathrm{yd}} where 1R_{\mathrm{yd}} = hcR. Show that R = 1.097 \times 10^7\ \mathrm{m^{-1}}.
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