InterviewSolution
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InterviewSolution
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A wave representing by the equation `y = a cos(kx - omegat)` is suerposed with another wave to form a stationary wave such that point `x = 0` is a node. The equation for the other wave isA. `y=asin(kx-omegat)`B. `y=-acos(kx+omegat)`C. `y=-cos(kx-omegat)`D. `y=-asin(kx-omegat)` |
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Answer» Correct Answer - B Since the point `x=0` is a node and reflection is taking place from point `x=0` This means that reflection nust be taking place from the fixed end and hence the reflected ray must suffer an additional phase change of `pi` or a path change of `(lamda)/(2)`. So , if `y_(i ncident)=acos(kx-omegat)` `impliesy_(refl ected)=acos(-kx-omegat+pi)=-acos(omegat+kx)` |
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