If the radius of the hydrogen atom is $53 \, pm$, the radius of the $He^{+}$ ion is closest to $...... \, pm$.
- A$108$
- B$81$
- C$27$
- D$13$
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The ionization energy of a singly ionized helium ion $(He^+)$ is equal to:
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Newtonian mechanics is applicable to which objects and not applicable to which objects?
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View SolutionMatch the following for hydrogen atom $(Z=1)$ :-
$(P). \lambda_{\max }$ in Lyman series $(i). \infty \rightarrow 1$ $(Q). v_{\min }$ in Balmer series $(ii). 2 \rightarrow 1$ $(R). \lambda_{\min }$ in Lyman series $(iii). 3 \rightarrow 2$ $(S). v_{\max }$ in Balmer series $(iv). \infty \rightarrow 2$
| $(P). \lambda_{\max }$ in Lyman series | $(i). \infty \rightarrow 1$ |
| $(Q). v_{\min }$ in Balmer series | $(ii). 2 \rightarrow 1$ |
| $(R). \lambda_{\min }$ in Lyman series | $(iii). 3 \rightarrow 2$ |
| $(S). v_{\max }$ in Balmer series | $(iv). \infty \rightarrow 2$ |
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