which one of the following statements holds?

Question

The temp variation under steady heat conduction across a composite slab of two materials with thermal conductivies K₁ and K₂ is shown in fig. then, which one of the following statements holds?                                                    

 

 

      (a) K₁ > K₂                                                                 (b) K₁ = K₂

      (c) K₁ = 0                                                            (d) K₁ < K₂