An observer moves towards a stationary source of sound with a speed $1/5^{th}$ of the speed of sound. The wavelength and frequency of the source emitted are $\lambda $ and $f$ respectively. The apparent frequency and wavelength recorded by the observer are respectively
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Source is stationary
$ \Rightarrow \lambda = {\rm{constant \,\,and\,\, f'}} = \frac{{{\rm{v}} + {{\rm{v}}_{\rm{s}}}}}{{\rm{v}}}$
$\mathrm{f}=\left(1+\frac{\mathrm{v}_{\mathrm{s}}}{\mathrm{v}}\right) \mathrm{f}=\left(1+\frac{1}{5}\right) \mathrm{f}=1.2 \mathrm{f}$
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