Which of the following is true ?
Correct answer: B. Paschen series is a line spectrum in the infra red.
- A. Lyman series is a continuous spectrum.
- B. Paschen series is a line spectrum in the infra red.
- C. Balmer series is a line spectrum in the ultraviolet.
- D. the spectral series formula can be derived from the Rutherford model of the hydrogen atom.
Explanation
The Paschen series consists of transitions ending at the n = 3 energy level, and its wavelengths lie in the infrared region. It is therefore a line spectrum in infrared. The likely choice is c, because the Balmer series is also a line spectrum but lies in the visible region, not the ultraviolet.
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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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