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) \[4000\,Hz\]
Correct Answer:
B
Solution :
Frequency \[n=\frac{\upsilon }{\lambda }=\frac{330}{1.1}=3000Hz\]