ExamBro
ExamBro
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 = \( 1.097 \times 10^7 \, m^{-1} \))

  1. A 91 nm
  2. B 122 nm
  3. C 365 nm
  4. D 656 nm
Verified Solution

Answer & Solution

Correct Answer

(B) 122 nm

Step-by-step Solution

Detailed explanation

\( \frac{1}{\lambda} = R \left( \frac{1}{n_1^2} - \frac{1}{n_2^2} \right) \) \( \frac{1}{\lambda} = (1.097 \times 10^7 \, m^{-1}) \left( \frac{1}{1^2} - \frac{1}{2^2} \right) \) \( \frac{1}{\lambda} = (1.097 \times 10^7) \left( 1 - \frac{1}{4} \right) \)…
Same subject
Explore more questions on app