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a
If the string has a standing wave and a component of travelling wave, then the potential energy per unit length of the points of maximum amplitude is non zero at some instant of time.
b
The sum of kinetic and potential energies (total energy) per unit length at nodes and antinodes is constant
c
If the string has a standing wave and a component of travelling wave, then the kinetic energy per unit length of the points of minimum amplitude is non-zero at some instant of time.
d
The total energy per unit length of a point midway between a node and an adjacent antinode is constant
answer is A, B, C, D.
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