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sir in this question i didn`t get the method of solution can u elaborate by another method please.. second thing in my note book the ans is 91 not 51... sorry if u mind but is the ans in my book is wrong..?

sir in this question i didn`t get the method of solution can u elaborate by another method please.. second thing in my note book the ans is 91 not 51... sorry if u mind but is the ans in my book is wrong..?

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Grade:12th pass

1 Answers

Khimraj
3007 Points
6 years ago
Amplitude of resultant wave
A = \sqrt{{A_{1}}^{2}+{A_{2}}^{2} + 2A_{1}A_{2}cos\Theta }
A2 = {{A_{1}}^{2}+{A_{2}}^{2} + 2A_{1}A_{2}cos\Theta }
and intensity (I \propto Amplitude)2
So intensity of resultant wave
I = I1 +  I2 +2\sqrt{I_{1}}\sqrt{I_{2}}cos\Theta
Intensity will be maximum when \Theta = 0.
So Imax = I + 4I + 2(I)(2I) = 9I.
Hope it clears. If you like anser then pleaqse approve it.

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