A long cylindrical tube carries a highly polished piston and has a side opening . A tuning fork
Channel: Doubtnut
Date: 2020-07-26

A long cylindrical tube carries a highly polished piston and has a side opening . A tuning fork of frequency `n` is sounded at the open end of the tube . The intensity of the sounded heard by the listener changes if the piston is moved in or out. At a particular position of the piston he hears a maximum sound . When the piston is moved through a distance of `9 cm`, the intensity of sound becomes minimum. If the speed of sound is `360 m//s`, the value of `n` is