A sinusoidal wave is sent along a string with a linear density of 2.0g/m. As it travels, the kinetic energies of the mass elements along the string vary. Figure a gives the rate dK/dt at which kinetic energy passes through the string elements at a particular instant, plotted as a function of distance x along the string. Figure b is similar except that it gives the rate at which kinetic energy passes through a particular mass element (at a particular location), plotted as a function of time t. For both figures, the scale on the vertical (rate) axis is set by Rs = 10 W. What is the amplitude of the wave?

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0.1 x (m) (a) 0.2 t (ms) (b) dK/ dt (W) dK/ dt (W)