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  4. A photon is emitted in transition from n =4 to n =1 level in hydrogen atom. The corresponding wavelength for this transition is (given, h =4 × 10-15 eVs ) :

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Q. A photon is emitted in transition from $n =4$ to $n =1$ level in hydrogen atom. The corresponding wavelength for this transition is (given, $h =4 \times 10^{-15} eVs$ ) :

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Solution:

$\frac{ hc }{\lambda}=\left[1-\frac{1}{16}\right](13.6\, eV )$
So, $\lambda=94.1 \,nm$