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 source emitted by any source be\[\lambda \] and f respectively. The apparent frequency and wavelength recorded by the observer are respectively

A) \[0.8f,\]\[0.8\lambda \]    

B)        \[1.2f,\]\[1.2\lambda \]

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

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