Chapter 80 of 2363 min read

Hydrogen spectrum and energy levels

Why this is asked: Only the Balmer series lands substantially in the visible range, since it ends at n=2 — Lyman (ending at n=1) is entirely ultraviolet and the rest are infrared. Energy levels En = −13.6/n² eV are always negative, approaching zero only at ionisation.

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Test yourself

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Match List I with List II.

List I (Spectral lines of hydrogen for transitions from)	List II (Wavelength, nm)
A. $n_2 = 3$ to $n_1 = 2$	I. 410.2
B. $n_2 = 4$ to $n_1 = 2$	II. 434.1
C. $n_2 = 5$ to $n_1 = 2$	III. 656.3
D. $n_2 = 6$ to $n_1 = 2$	IV. 486.1

Choose the correct answer from the options given below:

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