Describe an experiment to determine the velocity of sound in air using tuning forks of different frequencies and resonate tube.

Solution

A resonance tube is place to stand in a tall jar full of water.

Starting with a short length air column, a vibrating tuning fork is held over the mouth of resonance tube. The tube is raised until a point where a loud sound is heard. The length L of the air column and frequency f of tuning fork are recorded.

The experiment is repeated with other five tuning forks of different frequencies

Values of L, f  and  1/f are tabulated.

A graph of L against 1/f  is plotted and slope S is determined

The velocity, v, of sound = 4S.

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