Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 2 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observer [RPMT 1996; CPMT 2002]

Two sirens situated one kilometer apart are producing sound of frequen

1.	Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 2 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observer [RPMT 1996; CPMT 2002]
A.	8
B.	4
C.	4 : 1
D.	1
Answer» C. 4 : 1

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Two sirens situated one kilometer apart are producing sound of frequency 330 Hz. An observer starts moving from one siren to the other with a speed of 2 m/s. If the speed of sound be 330 m/s, what will be the beat frequency heard by the observer [RPMT 1996; CPMT 2002]

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