Two coherent sources of equal intensities produce a maximum of $100$ units. If the amplitude of one of the sources is reduced by $20$ %, then the maximum intensity produced will be:

100

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81

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89

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60

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100

20 % .

I_{1}

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Two coherent sources of equal intensities produce a maximum of 100 units. If the amplitude of one of the sources is reduced by 20%, then the maximum intensity produced will be: