Heat treatment of muscular pain involves radiation
Question:

Heat treatment of muscular pain involves radiation of wavelength of about $900 \mathrm{~nm}$. Which spectral line of H-atom is suitable for this purpose ?

${\left[\mathrm{R}_{\mathrm{H}}=1 \times 10^{5} \mathrm{~cm}^{-1}, \mathrm{~h}=6.6 \times 10^{-34} \mathrm{Js}\right.}$

$\left.\mathrm{c}=3 \times 10^{8} \mathrm{~ms}^{-1}\right]$

  1. Paschen, $5 \rightarrow 3$

  2. Paschen, $\infty \rightarrow 3$

  3. Lyman, $\infty \rightarrow 1$

  4. Balmer, $\infty \rightarrow 2$


Correct Option: 2,

Solution:

Paschen, $\infty \rightarrow 3$

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