In an experiment related to interference , Quinck's tube was employed to determine the speed of sound in air. A tunning fork of frequency 1328 Hz was usedas the sounding source . Initially , the apparatus , yielded a maximum sound intensity . Later , when the slidable tube was drawn by a distance of 12.5 cm, the intensity was found to be maximum for the first time . Determine the speed of sound in air .

In an experiment related to interference , Quinck's tube was employed

1.	In an experiment related to interference , Quinck's tube was employed to determine the speed of sound in air. A tunning fork of frequency 1328 Hz was usedas the sounding source . Initially , the apparatus , yielded a maximum sound intensity . Later , when the slidable tube was drawn by a distance of 12.5 cm, the intensity was found to be maximum for the first time . Determine the speed of sound in air .
Answer» Solution :A distance of `12.5 cm` drawn aside implies a DOUBLE path difference of `25 cm`. Since the shortest path difference , which enables the intensity to BECOME MAXIMUM once again is , obviously , `LAMDA`. so ` LAMBDA = 25 cm` `v = 1328 s^(-1) xx 25 cm = 332 m//s` Therefore , the speed of sound in air is `332 m//s`.