ON22 P23 Q4 Sound Wave Particles | Oct/Nov 2022 Waves | Cambridge A Level 9702 Physics

9702/23/O/N/22: (a) A progressive longitudinal wave travels through a medium from left to right. Fig. 4.1 shows the positions of some of the particles of the medium at time t 0 and a graph showing the particle displacements at the same time t0. Particle displacements to the right of their equilibrium positions are shown as positive on the graph and particle displacements to the left are shown as negative on the graph. The period of the wave is T.
(i) On Fig. 4.1, draw circles around two particles which are exactly one wavelength apart.
(ii) On Fig. 4.1, sketch a line on the graph to represent the displacements of the particles for the longitudinal wave at time t0 + T4.
(iii) State the direction of motion of particle Z at time t0 + T4.
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