A displacement–time graph for a fixed point in a medium shows that the first crest…

PHYSICS · Subjective · A Level · Physics · Waves · Waves

Problem

A displacement–time graph for a fixed point in a medium shows that the first crest occurs at

t = 1.5\,\text{ms}

and the next crest at

t = 5.5\,\text{ms}

. Explain how the time period of the sound wave is obtained from the graph and calculate its value.