An insulating foam board must limit the energy conduction rate to no more than across…

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

Problem

An insulating foam board must limit the energy conduction rate to no more than

500\,\text{W}

across an area of

1.6\,\text{m}^2

when a

15^{\circ}\text{C}

temperature difference is applied. If the foam’s thermal conductivity is

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

, what minimum thickness should the board have? (a)

0.042\,\text{m}

(b)

0.0067\,\text{m}

(c)

0.067\,\text{m}

(d)

1.29\,\text{m}