# NEET Physics Atoms Questions Solved

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NEET - 2012

Electron in hydrogen atom first jumps from third exicted state to second exicted state and then from second exicted to the first excited state. The ratio of the wavelengths ${\lambda }_{1}:{\lambda }_{2}$ emitted in the two cases is

(a) 7/5

(b) 27/20

(c) 27/5

(d) 20/7

Here, for wavelength ${\lambda }_{1}$

and for

We have $\frac{hc}{\lambda }=-13.6\left[\frac{1}{{n}_{2}^{2}}-\frac{1}{{n}_{1}^{2}}\right]$

So, for ${\lambda }_{1}$

Similarly, for ${\lambda }_{2}$

Hence, from Eqs. (i) and (ii), we get

$\frac{{\lambda }_{1}}{{\lambda }_{2}}=\frac{20}{7}$

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