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A series of lines in the spectrum of ato...

A series of lines in the spectrum of atomic hydrogen lies at 656.46 n, 486.27 nm, 439.17 nm and 410.29 nm. What is the wavelength of the next line in this series? What is the ionisation energy of the atom when it is ini the lower state of transition?

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`lamda_(next)=397.15nm,IE=3.240`eV
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