2-All medium particles do not have same energy.
3-Amplitude at distance x from a node is sinusoidal function of position x.
4- When mass m oscillates , it's oscillation energy is equal to half multiplied by mass, square of the angular frequency , square of the amplitude.
4- Consider a small length say dx ,get it's mass and it's oscillation energy and then integrate with respect to x with limits 0 and half wavelength which is distance between nearby nodes.
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