A car is moving towards a high cliff. The car driver sounds horn of frequency ‘f’. The reflected sound heard by the driver has a frequency 2f. If ‘v’ be the velocity of sound then the velocity the car, in the same velocity units, will be:-
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
When the sound is reflected from the cliff, it approaches the driver of the car.
Therefore, the driver acts as an observer and both the source (car) and observer are moving in same direction.
Hence, apparent frequency heard 
where 
velocity of sound, 
velocity of car 
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