Waves - Result Question 74
76. A car is moving towards a high cliff. The car driver sounds a horn of frequency . The reflected sound heard by the driver has frequency . If be the velocity of sound, then the velocity of the car, in the same velocity units, will be
[2004]
(a)
(b)
(c)
(d)
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Answer:
Correct Answer: 76. (c)
Solution:
- (c) Let
be the frequency of sound heard by cliff.
Now, for the reflected wave, cliff acts as a source,