MHT CET 2025 Physics question
A vehicle starts from rest and accelerates along straight path at 2 m/s. At the starting point of the vehicle, there is a stationary electric siren. How far has the vehicle nearly gone when the driver hears the siren at 94 % of its value when the vehicle was at rest? (speed of sound = 330 m/s)
Answer: (A)
Solution
The siren is stationary and the driver (observer) moves away from it with speed , so the apparent frequency is . Given : , so m/s. The vehicle starts from rest with constant
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