Fluorescence is the property of absorbing radiant energy of _ frequency and re-emitting energy of _ in the visible region of the electromagnetic spectrum.
Correct answer: B. High; low
- A. Low; high
- B. High; low
- C. High; high
- D. Low; low
Explanation
A fluorescent lamp usually a tubular electric lamp has a coating of fluorescent material on its inner surface and containing mercury vapor whose bombardment by electrons from the cathode provides ultraviolet light which causes the material to emit visible light.Ultraviolet light has a high frequency and re-emitting energy, as it in the visible region has a low frequency. So the correct option is B.
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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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