Physics - Sound Wave Question with Solution | TestHub

PhysicsSound WaveDopler's effectHard2 minPYQ_2020
PhysicsHardnumerical

In a car race, sound signals emitted by the two cars are detected by a detector on the straight track at the end of the race. The frequency observed for the two cars is330 Hzand360 Hzrespectively, while the original frequency is300 Hzfor both the cars. The race ends with a separation of100 mbetween the cars. Assume both cars move with constant velocity and velocity of sound is330 m s-1. Find the time taken by the winning car (in second).

Answer:
4.00
Solution:

330=330330−v1×300⇒  v1=30m s-1

360=330330−v2×300

330−v2=33012×10=275

v2=55m s-1 ; ΔV=25m s-1

100=ΔV×T  ⇒  T=4s

Stream:JEESubject:PhysicsTopic:Sound WaveSubtopic:Dopler's effect
⏱ 2mℹ️ Source: PYQ_2020

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