1© Manhattan Press (H.K.) Ltd. 10.6 Resonance tube – Measurement of speed of sound in air.

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1© Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air

2 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 148) Resonance tube Vibrate tuning fork over open end of tube - air column in tube is vibrated Speed of sound in air v = 2f ( 2 – 1 )

3 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 149) Resonance tube Go to Example 8 Example 8 Go to Example 9 Example 9

4 © Manhattan Press (H.K.) Ltd. End

5 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 150) Q: Q: A tuning fork of frequency 250 Hz is used with a resonance tube, closed at one end, to measure the speed of sound in air. The resonant lengths are found to be 0.30 m and 0.96 m. Calculate (a) the speed of sound, and (b) the end correction of the tube. Solution

6 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 150) Solution: Return to Text

7 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 151) Q: Q: A vibrating tuning fork is held near the end A of a tube AB. The piston P is moved slowly from A to B. A loud sound is first heard when AP is 0.15 m, and the next when AP is 0.47 m (see figure above). (a) For the second resonant length, draw a graph showing how the amplitude a of vibration of the air particles in the tube varies with the distance x from P. (b) Explain why the relationship between the two resonant lengths is not a simple ratio. Solution

8 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 151) Solution: Solution: (a)

9 © Manhattan Press (H.K.) Ltd Resonance tube – Measurement of speed of sound in air (SB p. 151) Solution (cont’d) : Return to Text