Question 5

A long, vertical tube contains water whose level can be varied. A tuning fork of frequency 440 Hz is struck, so that it vibrates, and is held over the top of the tube. The water level is lowered until a resonance is heard.The level is then lowered further until the next resonance is heard. The difference betwen the two levels is measured as 40 cm.

• (a) What was the velocity of sound in air in this experiment?
• (b) How much further must you lower the water level to obtain the next resonance?

Answer

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