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  4. The smallest wavelength of infrared region in hydrogen spectrum is:-

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Q. The smallest wavelength of infrared region in hydrogen spectrum is:-

JIPMERJIPMER 2019

Solution:

The smallest wavelength $\lambda_{min}$ in the infrared region of the hydrogen spectrum is in paschen series. For paschen series, minimum wavelength $n_2 = \infin n_1 = 3$
$\lambda_{min} =\frac{9}{R}=9\times10^{-7}=900\,nm$