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An observer moves towards a stationary source of sound with a speed \( 1 / 5^{\text {th }} \) of the speed of sound. The wavelength and frequency of the source emitted are \( \lambda \) and \( f \) respectively.
\( \mathrm{P} \) The apparent frequency and wavelength recorded by the

W observer are respectively
[CBSE PMT 2003]
(a) \( 1.2 \mathrm{f}, \lambda \)
(b) \( f, 1.2 \lambda \)
(c) \( 0.8 f, 0.8 \lambda \)
(d) \( 1.2 f, 1.2 \lambda \)
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