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JEE Main 2022 Physics question

PhysicsWavesJEE Main 2022

When a car is approaching the observer, the frequency of horn is 100 Hz. After passing the observer, it is 50 Hz. If the observer moves with the car, the frequency will be x/3 Hz where x = .

Answer: 200

Solution

Approaching: v/(v − . Receding: v/(v + . Dividing, 2 = (v + /(v − , so = v/3. Then v/(2v/3) =

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Question ID VK-025127