The figure shows the stimulated emission of two photons 'A' and 'B' during LASER action. What is the relation between wavelengths of two photons?
Correct answer: A. λA = λB
- A. λA = λB
- B. λA > λB
- C. λA < λB
- D. λA = 2λB
Explanation
Wavelengths of photons in a laser action are all the same hence the wavelength of A is equal to the wavelength of B. Lasers are monochromatic, having the same wavelengths.
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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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