A train approaching a railway platform w...

A train approaching a railway platform with a speed of `20ms^(-1)` starts blowing the whistle. Speed of sound in air is `340ms^(-1)`. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be

600 Hz

640 Hz

680 Hz

720 Hz

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WB JEE PREVIOUS YEAR PAPER-QUESTION PAPER 2012-Subject: Physics

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