11. As shown in Fig.5, the top side of a chamber is covered fully by a glass plate (1.2 mm thick) and a copper plate (5 mm thick). The top face area is 20 cm2. The remaining sides of the chamber consist of thermal insulation materials. One 40 watt hot plate is placed in this chamber. In thermal equilibrium at TL= 25 °C, what's the temperature TH? (thermal conductivity: kCu = 401 W/(m·K), kGlass = 0.8 W/(m·K))
(A) 35.65 °C
(B) 55.25 °C
(C) 75.15 °C
(D) 95.85 °C
(E) 155.05 °C

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