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A wall consists of alternating blocks of...

A wall consists of alternating blocks of length d and coefficient of thermal conducitivitly `K_(1) and K_(2)` respectively as shown in figure. The cross sectional area of the blocks are the same. The equivalent coefficient of thermal conductivity of the wall between left and right is

A

`(K_(1) +K_(2))/(2)`

B

`(2K_(1)K_(2))/(K_(1) +K_(2))`

C

`(K_(1)K_(2))/(3)`

D

`(3K_(1)K_(2))/(K_(1)+K_(2))`

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