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Statement of a problem № 3531

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In the Kundt's tube experiment, the length of the steel rod which is stroked is 120 cm long and the distance between heaps of cork dust is 8 cm when the rod is caused to vibrate longitudinally in air. If the ends of the tube are sealed and the air replaced by a gas and the experiment repeated, the distance between heaps is observed to be 10 cm. (a) What is the velocity of sound in the gas if the velocity in air is 340 m/s. (b) What is the velocity of sound in the rod?

Solution:
In the Kundt's tube experiment, the length of the steel rod which is stroked is

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