Multiple choice

Transition from a high energy to a low energy state in an atom or molecule results in:

  1. Emission of a photon at a particular wavelength

  2. Absorption of a photon at a particular wavelength

  3. A red-shift

  4. A blue-shift
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A Correct answer
Explanation

When an electron drops from a higher energy level to a lower one, it loses energy. This energy is released as a photon with a frequency corresponding to the energy difference between the two states.

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