Describe how you would determine the speed of sound in air using a resonance tube and several tuning forks.

Describe how you would determine the speed of sound in air using a resonance tube and several tuning forks.

• A glass tube which can be drained from bottom is filled with water.
• A sounding tuning fork of frequency f is brought to the mouth of the tube.
• The water is slowly drained until a loud sound is heard. The tap is closed and length L₁ is measured.
• The tuning fork is again sounded at the mouth of the tube and the water drained further until a loud sound is heard and distance L₂ is noted
• Velocity, v, of sound in air = 2f(L₂-L₁)

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