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| 1. |
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. |
| Answer» If the sound reaches the observes after being reflected 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 cases, on sound coming directly form the source and the other coming after reflection will have the same frequency (since velocity source w.r.t. observer is same in both the cases). Therefore, no beats will be heard. | |