Wave Motion 4 Question 9
9. A police car with a siren of frequency is moving with uniform velocity towards a tall building which reflects the sound waves. The speed of sound in air is . The frequency of the siren heard by the car driver is
(a)
(b)
(c)
(d)
(2011)
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Answer:
Correct Answer: 9. (a)
Solution:
Apparent frequency of sound heard by car driver (observer) reflected from the building will be