Consider a compound slab consisting of two different materials having equal thicknesses and ther...

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Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities \( K \) and \( 2 K \), respectively. The equivalent thermal conductivity of the slab is
(a) \( \frac{2}{3} K \)
(b) \( \sqrt{2} K \)
(c) \( 3 K \)
(d) \( \frac{4}{3} K \)
 
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