1.

An organ pipe, open from both end produces 5 beats per second when vibrated with a source of frequency 200 Hz. The second harmonic of the same pipes produces 10 beats per second with a source of frequency 420 Hz. The frequency of source is                                                   [DCE 2005]

A.            195 Hz                                     
B.            205 Hz
C.            190 Hz                                     
D.            210 Hz
Answer» C.            190 Hz                                     


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