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15 January, 15:11

A plane, opaque, surface M has the following properties: gray, diffuse, absorptivity = 0.7, surface area = 0.5 m2, temperature maintained at 500°C. Surface M experiences incoming radiant energy at 10,000 W/m2. Find the energy absorbed per unit time. Parts d - f will also refer to surface M.

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  1. 15 January, 16:00
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    The rate of energy absorbed per unit time is 3500W.

    Explanation:

    From the question, we were given the following parameters;

    Plane, opaque, gray, diffuse surface

    â = 0.7

    Surface area, A = 0.5m²

    Incoming radiant energy, G = 10000w/m²

    T = 500°C

    Rate of energy absorbed is âAG;

    âAG = 0.7 * 0.5 * 10000

    âAG = 3500W.

    The energy absorbed is measured in watts and denoted by the symbol W.
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