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The largest wavelength in the ultraviolet region of the hydrogen spectrum is `122` nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) isA. 802 nmB. 823 nmC. 1882 nmD. 1648 nm |
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Answer» Correct Answer - B The series in uv region is Lyman series. Longest wavelength corresponds to minimum energy which occurs in transition from `n =2` to `n =1` `:. 122 = (1//R)/((1)/(1^(2)-(1)/(2^(2))` ….(1) The smallest wavelength in the infrared region corresponds to maximum energy of paschen series. `lamda = (1//R)/((1)/(3^(2))-(1)/(infty))`....(2) from (1) and (2) `lamda = 823.5 nm`. |
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