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As shown in the figure, a source O of fr...

As shown in the figure, a source O of frequency 300 Hz moves towards north with a velocity of 30 m/s. A, B, C and D are four observers, each at a distance of 300 m from O. Velocity of sound is 330 m/s. As the source starts moving in the direction shown at t = 0 the frequency observed by A, B, C and D will be-

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