Wave parameters on displacement-time graph

Steps:

• Displacement-time graph for a wave shows oscillation over time.
• Amplitude is the maximum displacement value from the equilibrium line.
• Period is the time interval for one complete cycle, measured between identical points like peaks.
• Labels x and y correspond to these: x as peak height, y as cycle duration.

Why A is correct:

• Amplitude is defined as the maximum displacement; period as the time for one oscillation, directly measurable on the graph's axes.

Why the others are wrong:

• B: Frequency is 1/period, a derived quantity, not a direct time-axis measurement.
• C: Wavelength is a spatial distance between wave crests, absent in a time-only graph.
• D: Frequency and wavelength are not measurable on a displacement-time plot.

Final answer: A