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 `lamda` and f, respectively. The apparent frequency and wavelength recorded by the observer are, respectively.

Options

A. 1.2f, 1.2`lamda`
B. 1.2f, `lamda`
C. f, 1.2`lamda`
D. 0.8f, 0.8`lamda`

Answer

B