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18. Two sources are 8.5 cm apart and vibrate in phase at 5.0 Hz. A point on the third nodal line is 20.0 cm from

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18. Two sources are 8.5 cm apart and vibrate in phase at 5.0 Hz. A point on the third nodal line is 20.0 cm from one source and 25 cm from the other. a) Calculate the wavelength of the waves? b) Calculate the speed of the waves. [A- 4, C- 4] [A- 4, C- 4]

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