Modern Physics 1 Question 18
15. The largest wavelength in the ultraviolet region of the hydrogen spectrum is . The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
(a)
(b)
(c)
(d)
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Solution:
- The series in
region is Lymen series. Longest wavelength corresponds to minimum energy which occurs in transition from to .
The smallest wavelength in the infrared region corresponds to maximum energy of Paschen series.
Solving Eqs. (i) and (ii), we get