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two periodic waves of intesities l(1) an...

two periodic waves of intesities `l_(1) and l_(2)` pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is

A

`2(l_1+l_2) `

B

`l_1 + l_2`

C

`(sqrt(l_1) + sqrt(l_2))`

D

`(sqrt(l_1) - sqrt(l_2))`

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A
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