question_answer

Two sources of sound of same frequency are situated at a distance 1 metre apart. An observer is moving parallel to line joining them at a distance 10 metre. If distance  between   two  consecutive an tinode is observed to be \[1.1\] metre, then    frequency    of   source   is (\[\upsilon \] = 300 m/sec):

A)  \[1000\,Hz\]                     

B)                         \[3000\,Hz\]                     

C)         \[3500\,Hz\]                     

D)         \[4000\,Hz\]