A house wall consists of a -thick brick layer ( ) and a -thick styrofoam layer ( )

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

Problem

A house wall consists of a

0.10\,\text{m}

-thick brick layer (

k=0.80\,\text{W}/\text{m}\cdot\text{K}

) and a

0.020\,\text{m}

-thick styrofoam layer (

k=0.030\,\text{W}/\text{m}\cdot\text{K}

), both covering an area of

2.0\,\text{m}^2

. If the indoor surface is held at

20^{\circ}\text{C}

and the outdoor surface at

0^{\circ}\text{C}

, what is the approximate rate at which thermal energy leaves the house through this section of wall? (a)

1.3\times 10^{1}\,\text{W}

(b)

3.2\times 10^{2}\,\text{W}

(c)

5.1\times 10^{1}\,\text{W}

(d)

2.5\times 10^{1}\,\text{W}