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# Vibrating tuning fork of frequency 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 the intensity of sound changes from a maximum to minimum. If the speed of sound is then is

## The correct answer is:

### When the piston is moved through a distance of the path difference produced is

This must be equal to for maximum to change to minimum.

So,

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