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NEET 2003
Exam
NEET
Year
2003
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2003 · Physics · Thermal Properties of Matter

Consider a compound slab consisting of two different materials...

Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities KK and 2K2 K, respectively. The equivalent thermal conductivity of the slab is:Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K andConsider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and

Options

  1. A43K\frac{4}{3} K
  2. B2K\sqrt{2} K
  3. C3 K3 \mathrm{~K}
  4. D23K\frac{2}{3} K

Correct answer

A. 43K\frac{4}{3} K

Step-by-step solution

Consider a compound slab consisting of two different materials having equal thickness and thermal conductivities K and
\therefore 2lKeg(A)=l2KA+lKA\frac{2 l}{K_{e g}(A)}=\frac{l}{2 K A}+\frac{l}{K A}for series connection R=R1+P2\mathrm{R}=\mathrm{R}_1+\mathrm{P}_2 \Rightarrow K_{e g}=43\frac{4}{3}K
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