Heat energy is incident on the surface of a material at the rate of 1000 J min - 1 . If the coefficient of…

Heat energy is incident on the surface of a material at the rate of 1000 J min-1. If the coefficient of absorption is 0.8 and the coefficient of reflection is 0.1, then the amount of heat energy transmitted through the material in 5 minutes is
  1. $100J$
  2. 500 J
  3. $700 \, J$
  4. $900 \, J$

Solution

$Q_i = 1000 \, J/m$ $1 = r + a + t$ $t = 1 - 0.1 - 0.8 = 0.1$ $Q_t = 0.1 \times 1000 \times 5$ $= 500 \, J$

Asked in: MHT CET Full Test 1

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