A train, standing in a stationyard, blows a whistle of frequency 400Hz in still air. The wind starts blowing in the direction from the yard to the station at a speed of `10ms^(-1)`. What are the frequency, wavelength, and speed of sound for an observer standing on the station's platform ? Is the situation exactly identical to the case when the air is still and the observer runs towards the yard at a speed of `10ms^(-1)` ? Th speed of sound in still air can be taken as `340ms^(-1)`.