1. Why do waves propagates on a string? I mean, when we create a disturbance on one end, it affects all the string. How can it be? 2. How can there be a continuous flow of energy along a medium when the particles of the medium simply oscillate about their equilibrium positions? 3 Intuitively, when the string is tied to a free end (using massless ring), why does the ring moves upward as high as 2x the amplitude of the wave? Please give some references also. Thank you!