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In a resonance-tube experiment used to determine the speed of sound at room temperature, the tube is first filled with water and then with glycerine, giving readings v1 and v2 respectively. Which statement is correct in this situation?

1. v1 = 2v2
2. v1 is greater than v2
3. v1 is less than v2
4. v1 and v2 are independent of the liquid used in the tube

Correct answer: v1 and v2 are independent of the liquid used in the tube

Solution

The speed of sound in a resonance tube is determined by the properties of the gas above the liquid, not the liquid itself. Therefore, the readings v1 and v2, which correspond to different liquids, will not affect the speed of sound measured in the air above them.

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