The longest wavelength of Lyman series is equal to?
Correct answer: C. 4/3 RH
- A. 1/RH
- B. 9/RH
- C. 4/3 RH
- D. 4/2RH
Explanation
Explanation:The Lyman series corresponds to transitions to the n = 1 energy level in the hydrogen atom.The longest wavelength corresponds to the transition from n = 2 to n = 1, which has the smallest energy difference.Using the Rydberg formula: 1/λ = RH (1/n₁² - 1/n₂²), where n₁ = 1 and n₂ = 2.1/λ = RH (1/1² - 1/2²) = RH (1 - 1/4) = RH (3/4).Therefore λ = 4/(3RH)
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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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