A whistle of frequency 500 Hz tied to the end of a string of length 1.2 m revolves at 400 rev/min. A listener standing some distance away in the plane of rotation of whistle hears frequencies in the range (speed of sound = 340 m/s

(1) 436 to 586

(2) 426 to 574

(3) 426 to 584

(4) 436 to 674

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