The angular momentum of electron in a Bohr's orbit of H atom is `4.2178 xx 10^(-34) kg m^(2)s^(-1)`. Calculate the wavelength of the spectral line when the electrton falls from this level to the next lower level.

Explanation

To solve the problem of calculating the wavelength of the spectral line when the electron falls from one energy level to the next lower level in a hydrogen atom, we will follow these steps:

### Step 1: Determine the Principal Quantum Number (n)
Given the angular momentum \( L \) of the electron in the Bohr orbit:
\[ L = n \frac{h}{2\pi} \]
where \( h \) is Planck's constant (\( 6.626 \times 10^{-34} \, \text{Js} \)).
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