Question

# What is the shortest wavelength present in the Paschen series of spectral lines?

Solution

## Rydberg’s formula is given as $$hc/\lambda=21.76\times10^{-19}(1/n_1^2-1/n_2^2)$$$$h=6.6\times10^{-34}$$ is the plank's constant.$$c=3\times10^8$$ is speed of life.The shortest wavelength present in the Paschen series of the spectral lines is given for values $$n_1 = 3$$ and $$n_2 = \infty$$.From the above values, $$\lambda=819nm$$PhysicsNCERTStandard XII

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