Chemistry Atomic Structure DUHS 2022
PMDC Verified Question 54 of 95
The equation \( \bar{\nu} = R_h \left[ \frac{1}{2^2} - \frac{1}{n^2} \right] \) where \( n > 2 \) is the equation of H-spectrum for:
A
Paschen series
B
Lyman series
C
Balmar series
D
Pfund series
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Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Balmar series
Concept: The Rydberg formula calculates the wave number of spectral lines based on the energy levels involved in the electron transition.

Formula: $$ \bar{\nu} = R_h \left[ \frac{1}{n_1^2} - \frac{1}{n_2^2} \right] $$

Solution:
  • In the given equation, the lower energy level (destination shell) is locked at \( n_1 = 2 \).
  • The upper energy levels are \( n = 3, 4, 5\dots \) (since \( n > 2 \)).
  • Transitions that end at the \( n=2 \) shell exclusively generate the Balmer series, which lies predominantly in the visible light spectrum.


Why other options are incorrect: Lyman ends at \( n_1 = 1 \). Paschen ends at \( n_1 = 3 \). Pfund ends at \( n_1 = 5 \).

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