The wavelength of the photon...|MODERN PHYSICS|JEE-Main 2021

JEE MAIN 2021

25-02-2021 S2

Question

The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is :

Select the correct option:

194.8 nm

913.3 nm

490.7 nm

121.8 nm

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

$\begin{aligned} & \frac{1}{\lambda}=\mathrm{R}\left(\frac{1}{1^2}-\frac{1}{2^2}\right) \\ & \lambda=121.8 \mathrm{~nm} .\end{aligned}$

Question Tags

JEE Main

Physics

Easy

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