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JEE Main & Advanced Physics Wave Mechanics Question Bank Self Evaluation Test - Waves

  • question_answer
    A train has just completed a U-curve in a track which is a semicircle. The engine at the forward end of the semicircular part of the track while the last carriage is at the rear end of the semicircular track. The driver blows a whistle of frequency 200 Hz. Velocity of sound is 340 m/s. Then the apparent frequency as observed by a passenger in the middle of a train when the speed of the train is 30 m/s is     

    A)  209 Hz

    B)  288 Hz

    C) 200 Hz

    D) 181 Hz

    Correct Answer: C

    Solution :

    [c] The line of motion of engine is perpendicular to line of motion of the observer at that instant, so \[f'=f=200\,Hz\]


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