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Phase Change with Time #8211; If a particle at a distance x from origin has phase ɸ<sub>1</sub> at t<sub>1</sub> and ɸ<sub>2</sub> at t<sub>2</sub>. Then, ɸ<sub>1</sub> (ωt<sub>1</sub> #8211; kx) and ɸ<sub>2</sub> = (ωt<sub>2</sub> #8211; kx) ∴ ɸ<sub>1</sub> #8211; ɸ<sub>2</sub> = ω(t<sub>1</sub> #8211; t<sub>2</sub>) So, phase difference, ∆ɸ = 2π/T times; Time difference (∆t)
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