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NTA Abhyas JEE Main2020PhysicsThermal Properties of MatterPractice

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

Options

  1. A100   J
  2. B500   J
  3. C700   J
  4. D900   J

Correct answer

B. 500   J

Step-by-step solution

Q i = 1000  J / m I = r + a + t t = 1 − 0.1 − 0.8 = 0.1 s Q t = 0.1 × 1000 × 5 = 500  J

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