InterviewSolution
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InterviewSolution
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The largest wavelength in the ultraviolet region of the hydrogen spetrum is `122` nm. The samallest wavelength in the infrared ragaion of the hydrogen spetrum (to the nearest integer) isA. `802 nm`B. `823 nm`C. `1882 nm`D. `1648 nm` |
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Answer» Correct Answer - B The skallest , frequency end large wavwlength in ullraviolet region will be for transtion of from orbit `2` to orbit`1` `:. (1)/(lambda) = R ((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))` `rArr (1)/(122 xx 10^(-9)m) = R[(1)/(1^(2)) - (1)/(2^(2))] = R [(1 - (1)/(4)] = (3R)/(4)` E = (4)/(3 xx 122 xx 10^&(-9)) m^(-1)` The highest frequency and smaller wavelength for infrared reguion will be for transtionfrom `oo` ti 3rd orbit `:. (1)/(lambda) = R((1)/(n_(1)^(2)) - (1)/(n_(2)^(2)))` `rArr (1)/(lambda) = (4)/(3 xx 122 xx 10^(-9)) ((1)/(3^(2)) - (1)/(oo))` `:. lambda = (3 xx 122 xx 9 xx 10^(-9))/(4) = 823.5 nm` |
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