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Two periodic waves of intensities I1 an...

Two periodic waves of intensities `I_1` and `I_2` are travelling through a region in a same direction at the same time. What is the summation of maximum and minimum intensities?

A

`I_1+I_2`

B

`(sqrtI_1+sqrtI_2)`

C

`(sqrtI_1-sqrtI_2)`

D

`2(I_1+I_2)`

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