Three slabs, each of thickness , are placed in series. Their thermal conductivities…

PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

Three slabs, each of thickness

d

, are placed in series. Their thermal conductivities are

0.5\,\text{W m}^{-1}\text{K}^{-1}

1.0\,\text{W m}^{-1}\text{K}^{-1}

and

2.0\,\text{W m}^{-1}\text{K}^{-1}

respectively. What is the equivalent thermal conductivity

k_{\text{eq}}

of the combination? (a)

1.17\,\text{W m}^{-1}\text{K}^{-1}

(b)

0.86\,\text{W m}^{-1}\text{K}^{-1}

(c)

1.0\,\text{W m}^{-1}\text{K}^{-1}

(d)

0.29\,\text{W m}^{-1}\text{K}^{-1}