Wave Motion 4 Question 11
11. A police car moving at chases a motorcyclist. The police man sounds his horn at , while both of them move towards a stationary siren of frequency . Calculate the speed of the motorcycle, if it is given that the motorcyclist does not observe any beats (speed of sound ).
(2003, 2M)
(a)
(b)
(c) Zero
(d)
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Answer:
Correct Answer: 11. (b)
Solution:
- The motorcyclist observes no beats. So, the apparent frequency observed by him from the two sources must be equal.
Solving this equation, we get