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e travels, , with a definite, , Each particle of the, medium executes SHM, about its mean position, with the same, amplitude., , _ There is a continuous, , __ change of phase from, , one particle to the, next., , No particle of the, medium is permanently at rest., , There is no instant, when all the particles, are at the mean, positions together., , . There is flow of energy, across every plane, , a along the direction of, , _ propagation of the, wave., , The energy averaged, over a wavelength is, half kinetic and half, potential., , ithe, , All the particles have - ‘oa, , remains confin«, the region where it is, produced. :, , , , , , Except nodes, all, particles of the, medium execute SHM, with varying, amplitude., , All the particles, between two, successive nodes, vibrate in the same, phase, but the phase, reverses for particles, between next pair of, nodes., , The particles of the, medium at nodes are, permanently at rest., , Twice during each, cycle, all particles pass, through their mean, positions, simultaneously., , Energy of one region, remains confined in, that region., , Twice during each, cycle, the energy, becomes alternately, wholly potential and, wholly kinetic.