Wave Motion 4 Question 21
20. 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.
$(1985,3 M)$
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Answer:
Correct Answer: 20. F
Solution:
- For reflected wave an image of source $S^{\prime}$ can assumed as shown. Since, both $S$ and $S^{\prime}$ are approaching towards observer, no beats will be heard.
