Physics

Problem

Successive positive maxima on the displacement–time graph of a point in a sound wave occur at

t=2.5\,\text{ms}

and

t=7.5\,\text{ms}

. The frequency of the wave is a)

400\,\text{Hz}

200\,\text{Hz}

1.26\times10^{3}\,\text{Hz}

100\,\text{Hz}