The unit of Stefan's constant σ is, W m − 2 K − 1, W m 2 K − 4, W m − 2 K − 4, W m − 2 K 4

Stefan's law is E = σ ( T 4 ) ⇒ σ = E T 4 where, E = Energy Area × Time = Watt m 2 σ = Watt- m − 2 K 4 = W m − 2 K − 4

The unit of Stefan's constant σ is

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The unit of Stefan's constant

σ

PhysicsUnits and DimensionsNEET

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The correct answer is:

W m^{- 2} K^{- 4}

Stefan's law is $E = σ (T^{4})$ $\Rightarrow$ $σ = \frac{E}{T^{4}}$

where, $E =$ $\frac{Energy}{Area \times Time}$ $= \frac{Watt}{m^{2}}$

$σ = \frac{Watt- m^{- 2}}{K^{4}} = W m^{- 2} K^{- 4}$

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