Fundamentholfundamenthol
JEE Main2019Physics
Q.

An excited He+ ion emits two photons in succession, with wavelengths 108.5 nm and 30.4 nm, in making a transition to ground state. The quantum number n, corresponding to its initial excited state is (for photon of wavelength , energy ): 

  1. A

    n = 5

  2. B

    n = 7

  3. C

    n = 4

  4. D

    n = 6

Solution

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