question_answer

An observer moves towards a stationary source of sound with a speed 1/8th of the speed of sound. The wavelength and frequency of the sound emitted are\[\lambda \]and\[f\]respectively. The apparent frequency and wavelength recorded by the observer are respectively.

A)  \[0.4f,0.4\lambda \]

B)  \[0.6f,1.6\lambda \]

C) \[1.4f,\lambda \]

D) \[1.1f,\lambda \]