question the speed of sound in air on a certain...
Question: question the speed of sound in air on a certain...
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.
How large are the end effects?
What length of tube should be above the water to hear the 7th harmonic?
If the frequency of the tone is now increased to 1086 Hz, what length of pipe is now needed to hear the first resonance?