A pair of parallel glass panes, each of $3 \mathrm{~mm}$ thickness traps $2 \mathrm{~mm}$ layer of stagnant air. Thermal conductivities of glass and air are 0.5 and $0.02 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$, respectively. If the film heat transfer coefficient of air is $10 \mathrm{~W} \mathrm{~m}^{-2} \mathrm{~K}^{-1}$, then Biot Number is
(A) 1.50
(B) 1.00
(C) 0.06
(D) 0.04
A pair of parallel glass panes, each of $3 \mathrm{~mm}$ thickness traps $2 \mathrm{~mm}$ layer of stagnant air. Thermal conductivities of glass and air are 0.5 and $0.02 \mathrm{~W} \mathrm{~m}^{-1} \mathrm{~K}^{-1}$, respectively. If the film heat transfer coefficient of air is $10 \mathrm{~W} \mathrm{~m}^{-2} \mathrm{~K}^{-1}$, then Biot Number is
(A) 1.50
(B) 1.00
(C) 0.06
(D) 0.04