A source of sound with frequency `256 Hz` is moving with a velocity `V` towards a wall and an observer is stationary between the source and the wall. When the observer is between the source and the wall he will hear beats.

Explanation

If the soumd reaches the observer after being reflected from a stationary surface and the medium is also stationary,the image of the source will become the source of reflected dound. Thus in both the cases,one sound coiming directly from the source and other coming after reflection will have the same frequency ( since velocity of source w.r.t observer same in the both cases ).Therefore no beats will be heard.