A source produces a progressive sound wave moving horizontally. The wave propagates away from the source to the right. The graph shows how the displacement of the particles from their equilibrium positions changes with distance from the source at one particular 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 specific distance from the source at this instant. Which statement about how this particle is moving 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.