A) 1 : 2
B) 1 : 4
C) 4 : 1
D) 1 : 1
Correct Answer: C
Solution :
Rydbergs constant is given by \[R=\frac{m{{Z}^{2}}{{e}^{4}}}{8\varepsilon _{0}^{2}c{{h}^{3}}}\] For hydrogen Z = 1, for helium Z =2 \[\therefore \] \[\frac{{{R}_{He}}}{{{R}_{H}}}=\frac{{{(2)}^{2}}}{{{(1)}^{2}}}=\frac{4}{1}\]
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