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25 July, 01:29

Which of the following transitions (in a hydrogen atom) represent emission of the longest wavelength photon?

a) n = 1 to n = 2

b) n = 3 to n = 1

c) n = 3 to n = 4

d) n = 4 to n = 2

e) n = 5 to n = 4

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Answers (1)
  1. 25 July, 03:49
    0
    For a photon to be emitted, the electron must travel from a higher quantum level to a lower one. Therefore, options A and C are eliminated.

    The energy of a photon is given by Planck's equation:

    E = hc/λ; where λ is the wavelength

    As seen from the equation, a larger wavelength is observed when smaller energy transitions occur (since energy and wavelength are inversely proportional)

    The smallest transition occurs in option E, 5 to 4. Therefore, the answer is E.
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