Wave Motion 4 Question 24
23. An observer standing on a railway crossing receives frequency of $2.2 kHz$ and $1.8 kHz$ when the train approaches and recedes from the observer. Find the velocity of the train. (2005, 2M) (The speed of the sound in air is $300 m / s$.)
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Answer:
Correct Answer: 23. (b)
Solution:
- From the relation, $f^{\prime}=f\left(\frac{v}{v \pm v _s}\right)$, we have
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