1.

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) [KCET 2000; AMU 1999; Pb. PET 2003]

A.            436 to 586                              
B.            426 to 574
C.            426 to 584                              
D.            436 to 674
Answer» B.            426 to 574


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