The graph illustrates how the displacement $X$ of a gas molecule changes with time as a continuous sound wave travels through a gas. The speed of sound in the gas is $330\,\text{m s}^{-1}$. All the graphs below use the same zero time as the graph above. What is the displacement-time graph for a molecule that is $0.165\,\text{m}$ farther from the source of the sound?
Physics 9702 · AS & A Level · Progressive waves