Vibrating tuning fork of frequency n is placed near the open end of a long cylindrical tube. The tube has a side opening and is fitted with a movable reflecting piston. As the piston is moved through 8.75 cm, the intensity of sound changes from a maximum to minimum. If the speed of sound is 350 m/s. Then n is\n
1
\(500 \, \text{Hz}\)
2
\(1000 \, \text{Hz}\)
3
\(2000 \, \text{Hz}\)
4
\(4000 \, \text{Hz}\)