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

Explanation

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