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Electrons jump from fourth energy level ...

Electrons jump from fourth energy level to finally first energy level in one mole hydrogen atom. How many maximum possible numbers of photons can be emitted?

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Transition: `4rarr1`
Number of photons `=(n(n-1))/(2)=((3)(4))/(2)=6` For 1 mole of H-atom `=6xxN_(A)`
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