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AP EAMCET202421 May 2024Morning ShiftPhysicsThermal Properties of MatterActual

A slab consists of two identical plates of copper and brass. The free face of the brass is at 0^ C and that of copper at 100^ C . If the thermal conductivities of brass and copper are in the ratio 1: 4 , then the temperature of interface is

Options

  1. A20^ C
  2. B40^ C
  3. C60^ C
  4. D80^ C

Correct answer

D. 80^ C

Step-by-step solution

aligned & K ₂: K ₁=1: 4, & ~T ₁=0^ C , T ₂=100^ C aligned aligned & H= k₁ A(100-T) x = k₂ A(T-0) x & k₂ k₁ = 100-T T & 100-T T = 1 4 400-4 T=T & T=80^ C aligned

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