I Place a 250-G Ice Cube (Initially at 0°C)in a Styrofoam

question 54

Multiple Choice

I place a 250-g ice cube (initially at 0°C) in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm².If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)

• A) 9.6 × 10−⁵
• B) 2.8 × 10−⁶
• C) 1.15 × 10−²
• D) 2.3 × 10−⁴

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