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Q.
Whenever a hydrogen atom emits a photon in the Balmer
series:
Atoms
Solution:
Whenever a photon is emitted in Balmer series, it will be corresponding to the transition of electron to $n=2$ state from where it will further transit to ground state and emit a line corresponding to the transition of $n=2$ to $n=1$ in Lyman series of which the wavelength can be given as $\lambda=12431 / 10,2\, eV\approx 122\, nm$