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Find the ratio of series limit wavelengt...

Find the ratio of series limit wavelength of Balmer series to wavelength of first time line of paschen series.

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The correct Answer is:
`7 : 36`
`1/lambda_(B)=R[1/((2)^(2))-1/oo]implies 1/lambda_(B)=R/4`
`1/lambda_(p)=R [1/9-1/16]=(7R)/(144), lambda_(B) : lambda_(p)=7/36`
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