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# Question: question the speed of sound in air on a certain...

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Question:

The speed of sound in air on a certain day is 342 m/s. A tube is partially submerged in water and a note with a frequency of 960 Hz is played through headphones at the end of the tube (Figure 1). It is observed that the first resonance occurs when L=7.55 cm.

Figure 1: Diagrammatic representation of a set of headphones emitting a note through the end of a tube that is partially submerged in a container of water. When the length of the unsubmerged portion of the tube is L cm, the first resonance is observed.

Part 1)

How large are the end effects?

e=$e=$  cm$\text{cm}$

Part 2)

What length of tube should be above the water to hear the 7th${7}^{\text{th}}$ harmonic?

L=$L=$  cm$\text{cm}$

Part 3)

If the frequency of the tone is now increased to 1086 Hz, what length of pipe is now needed to hear the first resonance?

x=$x=$  cm$\text{cm}$