InterviewSolution
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InterviewSolution
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Two waves of nearly same amplitude , same frequency travelling with same velocity are superimposing to give phenomenon of interference . If `a_(1)` and `a_(2)` be their respectively amplitudes , `omega` be the frequency for both , `v` be the velocity for both and `Delta phi` is the phase difference between the two waves then ,A. the resultant intensity varies periodically with time and distance.B. the resulting intensity with `(I_(min))/(I_(max)) = (a_(1) - a_(2))/(a_(1) + a_(2))^(2)` is obtained.C. both the waves must have been travelling in the same direction and must be coherent.D. `I_(R) = I_(1) + I_(2) + 2 sqrt(I_(1) I_(2)) cos ( Delta phi)`, where constructive interference is obtained for path difference that are odd multiple of `1//2 lambda` and destructive interference is obtained for path difference that are even multiple of `1//2 lambda`. |
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Answer» Correct Answer - B::C This is the case of sustained interference in which position of maxima and minima remains fixed all over the screen. `(I_(min))/(I_(max)) = (( a_(1) - a_(2))/( a_(1) + a_(2)))^(2) ` And both waves must have beeen travelling in the same direction with a constant phase difference ( condition for coherence) |
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