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    				| 1. | 
                                    Figure shows a plot of the transverse displacements ofthe particles of a string at t-0 through which a travellingwave is passing in the positive x-direction. The wavespeed is 20 cm/s. Find (a) the amplitude,(b) thewavelength, (c) the wave number and (d) the frequencyof the wave | 
                            
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