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Electrons in a sample of H-atoms make tr...

Electrons in a sample of H-atoms make transition from state n=x to some lower excited state. The emission spectrum from the sample is found to contain only the line belonging to a particular series. If one of the photons has an energy of 0.6375 eV . Find the value of x.
`["Take" 0.6375 eV = 3/4 xx0.85 eV]`

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