Heat energy is incident on the surface at the rate of 1000J/min. If coefficient of absorption is and coeffiicient of reflection is 0.5 the heat energy
Heat energy is incident on the surface at the rate of 1000J/min. If coefficient of absorption is and coeffiicient of reflection is 0.5 the heat energy transmitted by the surface in 5 min is
A. 100J
B. 500J
C. 700 J
D. 900J
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Correct Answer - B
Given, rate of heat energy `(Q_(1))=1000J//min`
We know that,
`1=a+r+t`
Here, coefficient of absorption (a) = 0.8
Coefficient of reflection (r) =0.1
Now,
`1=0.1+0.1+t`
`t=1-0.9`
The rate of transmitter heat energy in 5 min `Q_(t)=theta_(i)xxtxx(time)=1000xx0.1xx5=500J`
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