For gaining atomic spectra, an evacuated glass tube is filled with:
Correct answer: B. Hydrogen
- A. Neon
- B. Hydrogen
- C. Carbon dioxide
- D. Sulphur dioxide
Explanation
Atomic spectra are the spectra of frequencies of electromagnetic waves emitted or absorbed during transitions of electrons between energy levels within an atom. It is different for every atom. Hydrogen gas is most commonly used to fill the glass tube as it results in different series, namely the Lyman, Balmer, Paschen, Brackett and Pfund series.
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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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