During the production of LASER, when the excited state E2 contains more atoms than the ground state E1, the state is known as:
Correct answer: A. Population inversion
- A. Population inversion
- B. Ground State
- C. Excited state
- D. Metastable state
Explanation
Population inversion refers to a condition in which the number of atoms or molecules in an excited state (such as E2) is greater than the number in the ground state (such as E1). This is a necessary condition for the amplification of light in a laser.
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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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