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A progressive wave of frequency 500Hz is...

A progressive wave of frequency 500Hz is travelling with a velocity of 360 m`//` s. How far part are two points `60^(@)` out of phase ?

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`lambda=v//n=(360)/(500)=0.72m`
As, `Deltaphi=(2pi)/(lambda)Deltax`
`:. Deltax=(lambda)/(2pi)Deltaphi=(0.72)/(2pi)xx(pi)/(3)=0.12m`
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