With what speed should an observer move towards a stationary source of sound so that frequency of sound emitted by source may appear double of its actual frequency as listen by the observer. Take speed of sound "v" and that of observer as "a":

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With what speed should an observer move towards a stationary source of sound so that frequency of sound emitted by source may appear double of its actual frequency as listen by the observer. Take speed of sound "v" and that of observer as "a":