Which of the following statements is inconsistent with Bohr's set of postulates regarding the hydrogen atom model regarding the emission and absorption of light?
Correct answer: D. To jump from a higher energy to a lower energy, an electron absorbs a photon of frequency such that the photon's energy is exactly the energy difference between the two orbits
- A. Energy levels of the electrons are stable and discrete
- B. An electron emits or absorbs radiation only when making a transition from one energy level to another
- C. To jump from lower energy to higher energy, an electron must absorb a photon of precisely the right frequency such that the photon's energy equals the energy difference between the two orbits
- D. To jump from a higher energy to a lower energy, an electron absorbs a photon of frequency such that the photon's energy is exactly the energy difference between the two orbits
- E. None of the above
Explanation
Bohr's Model has quantised angular momentum, which is option A. It is consistent with the model. Energy changes only take place if an electron changes shells, as stated in option B. It is consistent with the model. When an electron jumps from a lower orbit to a higher orbit, it absorbs energy such that ΔE= E2-E1. It is consistent with the model. When an electron jumps from a higher orbit to a lower orbit, it emits energy. In the question statement, it's wrong that "It absorbs energy". Hence, this is not consistent with the model. Thus, Option D is correct, while others are rendered as incorrect.
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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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