1.

A closed organ pipe of length 28 cm closed at one end is found to be at resonance when a tuning fork of frequency 850Hz is sounded near the open end. If velocity of sound in air is 340 m/s, then theA. air in the pipe is vibrating in fundamental modeB. air in the pipe is vibrating in first overtoneC. end correction of the pipe is 1cmD. end correction of the pipe is 2cm.

Answer» BD
`lambda=(v)/(u)=40 cm`
`(3lambda)/(4)=28+eimplies"first overtone"`


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