the fundamental frequency of a sonometer wire of length is `f_(0)`.A bridge is now introduced at a distance of `Deltal`from the centre of the wire `(Deltal lt lt l )`. The number of beats heard if their fundamental mode are
A. `(8f_(0)Delta|)/|`
B. `(f_(0)Delta|)/|`
C. `(2f_(0)Delta|)/|`
D. `(4f_(0)Delta|)/|`