CUET · PHYSICS · PYQ PAPER 2025
The smallest wavelength in the spectral lines of the Paschen series of hydrogen atom is: (R is the Rydberg's constant in Å-1)
- A 9/R Å
- B R/9 Å
- C 9R/21 Å
- D 21/R Å
Answer & Solution
Correct Answer
(A) 9/R Å
Step-by-step Solution
Detailed explanation
\( \frac{1}{\lambda} = R \left( \frac{1}{n_f^2} - \frac{1}{n_i^2} \right) \) \( n_f = 3 \), \( n_i = \infty \) for smallest wavelength \( \frac{1}{\lambda} = R \left( \frac{1}{3^2} - \frac{1}{\infty^2} \right) \)…
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