Two coherent sources of equal intensities produce \( \mathrm{V} \) a maximum of 100 units. If th...

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Two coherent sources of equal intensities produce
\( \mathrm{V} \) a maximum of 100 units. If the amplitude of one of the sources is reduced by \( 20 \% \), then the maximum intensity produced will be :
(1) 100
(2) 81
(3) 89
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