question_answer

An observer moves towards a stationary source of sound with a speed 1/5th 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) \[0.8f, 0.8\lambda \]                    

B) \[1.2\,f,\, 1.2\lambda \]

C) \[1.2f,\,\,\lambda \]          

D) \[f,\, 1.2\lambda \]