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NEET 2002
Exam
NEET
Year
2002
Subject
Physics
Chapter
Thermal Properties of Matter

NEET 2002 · Physics · Thermal Properties of Matter

Unit of Stefan's constant is:

Unit of Stefan's constant is:

Options

  1. AWm2 K4\mathrm{Wm}^2 \mathrm{~K}^4
  2. BWm2 K−4\mathrm{Wm}^2 \mathrm{~K}^{-4}
  3. CWm−2 K−1\mathrm{Wm}^{-2} \mathrm{~K}^{-1}
  4. DWm−2 K−4\mathrm{Wm}^{-2} \mathrm{~K}^{-4}

Correct answer

D. Wm−2 K−4\mathrm{Wm}^{-2} \mathrm{~K}^{-4}

Step-by-step solution

Stefan's law is (E=\sigma\left(T^4\right)) ⇒σ=ET4where, E= Energy  Area × Time = Watt m2σ= Watt −m2k4= Watt −m−2k−4\begin{aligned} & \Rightarrow \sigma=\frac{E}{T^4} \\ & \text{where, } E=\frac{\text{ Energy }}{\text{ Area } \times \text{ Time }}=\frac{\text{ Watt }}{m^2} \\ & \sigma=\frac{\text{ Watt }-m^2}{k^4}=\text{ Watt }-m^{-2} k^{-4} \end{aligned})$
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