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QPage 97: Q4: HC Verma: Concepts of Physics - Volume 2 Heat Transfer Page 97: Q4 Solution: The thermal radiation emitted by a body is proportional to…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often assume the exponent $4$ applies to any material, but the Stefan–Boltzmann law $P=sigma,varepsilon,A,T^4$ contains the emissivity $varepsilon$. Only a perfect blackbody ($varepsilon=1$) yields $n=4$; real bodies have $varepsilon<1$ and may deviate from the $T^4$ dependence.

The thermal radiation emitted by a body is proportional to TnT^n where T is its absolute temperature. The value of n is exactly 4 for

Multiple Choice Options

  • A a blackbody
  • B all bodies
  • C bodies painted black only
  • D polished bodies only

Step-by-Step Verified Solution

**Answer:** (a) a blackbody. **Step-by-Step Explanation:** For a blackbody, the emitted radiation is exactly proportional to T_. For other bodies, the exponent may differ slightly.

All Questions in this Chapter

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