NEET 2004 Physics question
A car is moving towards a high cliff. The car driver sounds a 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 of the car, in the same velocity units, will be -
Answer: (1)
Solution
Let the car speed be . The cliff (stationary observer) receives from the approaching source. The cliff then acts as a stationary source of frequency
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