A) 67
B) 81
C) 89
D) 90
Correct Answer: B
Solution :
Intensity of each source,\[I=\frac{100}{4}=25\,\text{unit}\] If the intensity of one source is reduced by 36%, then \[{{I}_{1}}=25\,\text{unit}\]and \[{{I}_{2}}=25-\frac{25\times 36}{100}=16\,\text{unit}\] Hence, resultant intensity at the same point will be \[I={{I}_{1}}+{{I}_{2}}+2\sqrt{{{I}_{1}}{{I}_{2}}}\] \[=25+16+2\sqrt{25\times 16}=81\,\text{unit}\]You need to login to perform this action.
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