Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Units and Measurements

Question:

The unit of Stefan's constant σ is

Options:

$Wm^{−2}K^{−1}$

$Wm^{2}K^{−4}$

$Wm^{−2}K^{−4}$

$Wm^{−2}K^{4}$

Correct Answer:

$Wm^{−2}K^{−4}$

Explanation:

Stefan's law is P =σA(T4) σ=$\frac{PT^4}{A}$

⇒ σ=$Wm^{−2}K^{4}$