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A Kundt's tube apparatus has a copper rod

Question:

A Kundt's tube apparatus has a copper rod of length $1.0 \mathrm{~m}$ clamped at $25 \mathrm{~cm}$ from one of the ends. The tube contains air in which the speed of sound is $340 \mathrm{~m} \mathrm{~s}^{-1}$. The powder collects in heaps separated by a distance of $5.0 \mathrm{~cm}$. Find the speed of sound waves in copper.

Solution:

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