The hydrogen atoms are excited to the stationary state with principal quantum number n = 4. The maximum number of spectral lines observed is:
Correct answer: D. 6
- A. 2
- B. 4
- C. 3
- D. 6
Explanation
Number of spectral lines = n(n-1)/2. For n=4, 4(4-1)/2 = 6. Alternatively, transitions are 4→3, 4→2, 4→1, 3→2, 3→1, 2→1, totaling 6 lines.
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About Atomic Spectra
Atoms emit or absorb light at specific wavelengths because electrons occupy quantized energy levels and change levels by absorbing or releasing photons. The topic covers emission and absorption spectra, spectral series, hydrogen’s line spectrum, energy-level transitions, and the relation between wavelength, frequency and photon energy.
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