If an atom exists in excited state n = 3 the number of transitions that take place is
Correct answer: B. 3
- A. 1
- B. 3
- C. 2
- D. 4
Explanation
An atom in an excited state can transition to any of the lower energy levels. If an atom is in the excited state where the principal quantum number n=3It can transition to states with n=2 or n=1Each transition corresponds to the emission of a photon with a specific energy (or wavelength). The number of possible transitions is given by the formula n(n−1)/2 where n is the initial energy level. So, for an atom in the n=3 state, the number of possible transitions is: = 3(3−1) /2 =3These transitions aren=3→2 ,n=3→1 n=2→1
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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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