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Emission transitions in the Paschen series end at orbit n=3 and start from orbit n and can be represented as v=`3.29xx10^(15)(Hz)[1//3^(2)-1//n^(2)]`. Calculate the value of n if the transition is observed at 1285 nm. Find the region of the spectrum. |
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Answer» `v=c/lambda=(3.0xx10^(8) ms^(-1))/(1285xx10^(-9) m)` `=3.29xx10^(15)(1/3^(2)-1/n^(2))` or `1/n^(2)=1/9-(3.0xx10^(8))/(1285xx10^(-9))xx1/(3.29xx10^(15))` `=0.111-0.071=0.04=1/25` or `n^(2)=25` or `n=5` The radiation corresponding to `1285 nm` lies in the infrared region. |
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