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A boy is jerking one end of a taut string. The wave train propagating to the right has been shown in the figure. (a) Why the crests are farther apart as
A boy is jerking one end of a taut string. The wave train propagating to the right has been shown in the figure.       Why the crests are farther apart as we move away from the boy.    Which particle on the string a or b is having higher speed?