A source produces a progressive sound wave along the horizontal direction. The wave moves away from the source towards the right. The graph illustrates how the displacement of particles from their equilibrium positions changes with distance from the source at one specific moment. Displacements to the right of the equilibrium positions are taken as positive. Position Y shows the displacement of a particle in the sound wave at a particular distance from the source at this instant. Which statement about the motion of this particle is correct?
- AThe particle is moving away from the source.
- BThe particle is moving towards the source.
- CThe particle is moving upwards.
- DThe particle is moving downwards.