CUET · PHYSICS · PYQ PAPER 2025
In the atomic hydrogen line spectrum, the wavelength of the first line of the Lyman series is (Given: Rydberg constant R = \( 1.097 \times 10^7 \, m^{-1} \))
- A 91 nm
- B 122 nm
- C 365 nm
- D 656 nm
Answer & Solution
Correct Answer
(B) 122 nm
Step-by-step Solution
Detailed explanation
\( \frac{1}{\lambda} = R \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \) \( \frac{1}{\lambda} = (1.097 \times 10^7 \, m^{-1}) \left( \frac{1}{1^2} - \frac{1}{2^2} \right) \) \( \frac{1}{\lambda} = (1.097 \times 10^7) \left( 1 - \frac{1}{4} \right) \)…
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