A thin flat plate 2 m x 2 m is hanging freely in air. The temperature of the surroundings is 25°C. Solar radiation is falling on one side of the plate at the rate of 500 W/m2. The temperature of the...

A thin flat plate 2 m x 2 m is hanging freely in air. The temperature of the surroundings is 25°C. Solar radiation is falling on one side of the plate at the rate of 500 W/m2. The temperature of the plate will remain constant at 30°C, if the convective heat transfer coefficient (in W/m2°C) is:

(a) 25                     (b) 50

(c) 120                   (d) 200