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Monochromatic radiation of specific wave...

Monochromatic radiation of specific wavelength is incident on H-atoms in ground state. H-atoms absorb energy and emit subsequently radiations of six different wavelength. Find wavelength of incident radiations:

Text Solution

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The correct Answer is:
97.25
`(n(n-1))/2=6, n=4`,
n=4, `E_(4) =-0.85 eV`
`n=1, E_(1) = -13.6` eV
`therefore DeltaE = 12.75`e V
`12.75 eV = (1240 eV nm)/lambda` (since h = 1240 eVnm)
`lambda = 97.25` nm
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