Hydrogen atom has an emission series based on where an electron lands after it is excited. For n=1 Layman series, n=2 Balmer series, and n=3 Paschen series. Suppose 3 electrons were excited to n=5 state, and each one of them returned to n=1, n=2 and n=3 state. What is the wavelength of the photon in nano-meters when electron returned to n = 1 state from n=5 state?
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