Q. 55

A Kundt’s tube apparatus has a steel rod of length 1.0 m clamped at the centre. It is vibrated in its fundamental mode at a frequency of 2600 Hz. The Iycopodium powder dispersed in the tube collects into heaps separated by 6.5 cm. Calculate the speed of sound in steel and in air.

Answer :

Given:
Length at which steel rod is clamped


Fundamental mode of frequency


Distance between the two heaps:



Since Kundt’s tube apparatus is a closed organ pipe, its fundamental frequency is given by:





(b)





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