A sound source S is vibrating at the open mouth of a quinker’s tube as shown in the figure. At another mouth, analyser A is situated which analyses the amplitude and intensity of vibration. The tube SBA is stationary whereas the tube SCA is movable. The minimum intensity at A for any position of C is 81 units. This intensity constantly increases to 1600 units at a distance of 1.65cm from this position. If the frequency of sound emitted by the source is X Hz, then the value of X/1000 will be …..

 $V=330m/s$