The following diagram indicates the energy levels of a certain atom when the system moves from 2E level to E, a photon of wavelength λ is emitted.
Correct answer: D. 3λ
- A. λ/3
- B. 3λ/4
- C. 4λ/3
- D. 3λ
Explanation
When the photon transitions between energy levels 2E and E: E= 2E-E= EE= hc/λso, λ =hc/EWhen the photon transitions between energy levels 43E and E: E= (4/3) E-E = E/3E3 = hc/λ' 'λ= 3hc/EFrom above we know =hc/E so when we substitute this into the equation of ' we get:'λ=3λ So the correct option is option D.
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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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