Which one of the following will produce a pink colour in a discharge tube?
Correct answer: C. Helium
- A. Neon
- B. Nitrogen
- C. Helium
- D. Oxygen
Explanation
A tube containing charged electrodes and filled with a gas in which ionization is induced by an electric field. The gas molecules emit light as they return to the ground state. Each gas has a characteristic colour in the discharge tube, shown in the figure below. A) Neon has a red colour in the discharge tube. B) Nitrogen has a purple colour in the discharge tube. C) Helium has a pink colour in the discharge tube. D) Oxygen has a violet colour in the discharge tube. Therefore, C is the correct answer since He has a pink colour in the discharge tube.
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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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