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It is given in ncert that at an open boundary, reflected wave is given by the equation y​​ r (x,t)=asin(kx-wt) while it is given in many books that y r =ain(kx+wt).which one is correct?

It is given in ncert that at an open boundary, reflected wave is given by the equation y​​r(x,t)=asin(kx-wt) while it is given in many books that yr=ain(kx+wt).which one is correct?

Grade:11

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