InterviewSolution
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InterviewSolution
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Assertion. In Lyman series of H-spectra, the maximum wavelength of lines is 121.56 nm Reason. Wavelength is maximum when the transition is from the very next levelA. If both assertion and reason are true, and reason is the true explanation of the arrertionB. If both assertion and reason are true, but reason is not the true explanation of the assertionalC. If assertion is true, but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - A `(1)/(lamda) = R_(H) Z^(2) [(1)/(n_(1)^(2)) - (1)/(n_(2)^(2))]` For Lyman series, `n_(1) = 1`. For the next level, `n_(2) = 2`. Hence, `(1)/(n_(1)^(2)) - (1)/(n_(2)^(2))` will be minimum or `lamda` will be maximum. `((1)/(lamda) = 109678 xx (1)^(2) [(1)/(1^(2)) - (1)/(2^(2))] cm^(-1) = 109678 xx (3)/(4) cm^(-1) or lamda = (4)/(3) xx (1)/(109678) cm = 121.56 xx 10^(-7) cm = 121.56 xx 10^(-9) m = 121.56 nm)` |
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