MHT CET · Physics · Thermal Properties of Matter
If 120 J of thermal energy is incident on area \(3 \mathrm{~m}^2\), the amount of heat transmitted is 12 J, coefficient of absorption is \(0.6\), then the amount of heat reflected is
- A 24 J
- B 30 J
- C 36 J
- D 40 J
Answer & Solution
Correct Answer
(C) 36 J
Step-by-step Solution
Detailed explanation
\(Q_a = a \times Q_i = 0.6 \times 120 \mathrm{~J} = 72 \mathrm{~J}\) \(Q_r = Q_i - Q_a - Q_t = 120 \mathrm{~J} - 72 \mathrm{~J} - 12 \mathrm{~J} = 36 \mathrm{~J}\)
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