MHT CET · Physics · Thermal Properties of Matter
Heat energy is incident on the surface at the rate of \(1000 \mathrm{~J} / \mathrm{min}\). If coefficient of absorption is 0.8 and coefficient of reflection is 0.1 , then heat energy transmitted by the surface in 5 minute is
- A 700 J
- B 500 J
- C 100 J
- D 900 J
Answer & Solution
Correct Answer
(B) 500 J
Step-by-step Solution
Detailed explanation
Considering energy conservation:
Coe. of transmission +Coe. of absorption +Coe. of reflection \(=1\)
Therefore, Coefficient of transmission \(=1-0.8-0.1=0.1\)
It means \(10 \%\) of incident energy will be transmitted.
Hence transmitted energy in \(5 \mathrm{~min}\)
\(=1000 \times 0.1 \times 5=500 \mathrm{~J}\)
Coe. of transmission +Coe. of absorption +Coe. of reflection \(=1\)
Therefore, Coefficient of transmission \(=1-0.8-0.1=0.1\)
It means \(10 \%\) of incident energy will be transmitted.
Hence transmitted energy in \(5 \mathrm{~min}\)
\(=1000 \times 0.1 \times 5=500 \mathrm{~J}\)
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