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

Electron in a sample of `H-` atoms make transitions from state `n=x` to some lower excited state. The emission spectrum from the sample is found to contain only the lines belonging to a particular series. If one of the photons had an energy of `0.6375 eV`. Then find the value of `x. [" Take " 0.6375eV=(3)/(4)xx0.85eV]`.

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The correct Answer is:
8
`Delta E = (3)/(4) xx 0.85 = 0.6375` Which is less than 0.85
Minimum energy level is 4
`Delta E = 13.6 [(1)/(4^(2))-(1)/(h^(2))] rArr :. N = 8`
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