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What is the shortest wavelength present in the Paschen series of spectral lines?

Text Solution

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`n=oo , R = 1.097 xx 10^7 m^(-1) `
`(1)/(lamda ) = R [(1)/(3^2) - (1)/(n^2)]`
` (1)/( lamda )= 1.097 xx 10^7 [1/9]`
` lamda = (9)/(1.097 xx 10^7 [1/9]`
` lamda =(9 )/( 1.097 xx 10^7) = 8.199 xx 10^(-7) = 8199 Å`
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