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
AIPMT 2003, Medium
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(a) $n' = \frac{{v + {v_0}}}{v}.n = \frac{{v + \frac{v}{5}}}{v}.f = \frac{6}{5}f = 1.2f$
and since the source is stationary, so wave length remains unchanged for observer.
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