Question: 3 . Sunlight falls on a concrete wall starting from 1 0 am and the flux is 8 0 0 W / m 2 .

3. Sunlight falls on a concrete wall starting from 10 am and the flux is 800 W/m2. The initial temperaturewas 30C. Determine the surface temperature and the temperature at a depth of 5 cmat 12:00noon. Thermaldiffusivity =4.92107 m2/s and conductivity =1.28 W/m-K

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