The excited state which persists for an unusually longer period of time is called
Correct answer: C. Metastable state
- A. Ground state
- B. Ionized state
- C. Metastable state
- D. Ordinary excited state
Explanation
A metastable state is an excited state of an atom or molecule that has a longer-than-average lifetime before spontaneously transitioning to a lower-energy state. These states are often important in laser physics and atomic spectroscopy.
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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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