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5 marks
5 marksCircular water waves are produced by vibrating dippers at points P and Q, as illustrated in Fig. 4.1.
Fig. 4.1 (not to scale)
The waves from P alone have the same amplitude at point R as the waves from Q alone. Distance PR is 44 cm and distance QR is 29 cm.
The dippers vibrate in phase with a period of 1.5 s to produce waves of speed 4.0 cm s–1.
i)
Calculate the wavelength of the waves.
wavelength = .................................................... cm [2]
ii)
Calculate the path difference at point R of the waves from P and Q.
Give your answer in terms of the wavelength λ of the waves.
path difference = ....................................................... λ [1]
iii)
Describe the motion, if any, of the water particles at point R.
Explain your answer.
[2]
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