Two periodic waves of intensities I1 and...

Two periodic waves of intensities `I_1` and `I_2` pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is :

`I_1 + I_2`

`(sqrtI_1 + sqrtI_2)^2`

`(sqrtI_1 - sqrtI_2)^2`

`2(I_1 + I_2)`

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