Q. The unit of Stefan-Boltzmann constant is

स्टीफ़न-बोल्ट्ज़मैन स्थिरांक की इकाई है

A
W/m²K
B
W/m²K⁴
C
J/K
D
N/m

Explanation

The Stefan-Boltzmann constant σ\sigma relates the total energy radiated per unit area of a blackbody to the fourth power of its temperature, so its units must be:

Power per unit area per T4=Wattmeter2⋅K4=W/m2K4\text{Power per unit area per } T^4 = \frac{\text{Watt}}{\text{meter}^2 \cdot K^4} = \text{W/m}^2 K^4

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