Wave Motion 4 Question 21

20. A source of sound with frequency 256Hz 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. (1985,3M)

Integer Answer Type Questions

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Answer:

Correct Answer: 20. (a)

Solution:

  1. For reflected wave an image of source S can assumed as shown. Since, both S and S are approaching towards observer, no beats will be heard.



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