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Question
Heat energy is incident on the surface at the rate of 1000 J/min. If the coefficient of absorption is 0.8 and the coefficient of reflection is 0.1 then heat energy transmitted by the surface in 5 minutes is ______.
Options
100J
500J
700J
900J
MCQ
Fill in the Blanks
Solution
Heat energy is incident on the surface at the rate of 1000 J/min. If the absorption coefficient is 0.8 and the reflection coefficient is 0.1 then the heat energy transmitted by the surface in of 5 minutes is 500J.
Explanation:
r + a + t = l
∴ t = 1 − r − a
= 1 − 0.8 − 0.1
= 1 − 0.9
= 0.1
Q = 1000 J/min
∴ Heat energy transmitted per minute
Qt = Q × t
= 1000 × 0 .1
= 100J
∴ Heat energy transmitted in 5 minutes
= 100 × 5
= 500J
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Heat Transfer
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