A hot plane surface at 100°Cis exposed to air at25°C with a combined heat transfer coefficient of 20 W/m·K. The heat loss from the surface is to be reduced by half by covering it with sufficient insulation with a thermal conductivity of 0.10 W/m·K. Assuming the heat transfer coefficient to remain constant, the required thickness of insulation is
(a) 0.1cm
(b) 0.5 cm
(c) 1.0 cm
(d) 2.0 cm
(e) 5 cm
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