Mathematical Tools Units & Dimensions Units Question 57

Question: Unit of Stefan’s constant is [MP PMT 1989]

Options:

A) $ J,{{s}^{-1}} $

B) $ J,{{m}^{-2}}{{s}^{-1}}{{K}^{-4}} $

C) $ J,{{m}^{-2}} $

D) $ J,s $

Answer:

Correct Answer: B

Solution:

$ \frac{Q}{t}=\sigma AT^{4}\Rightarrow \sigma =J{{m}^{-2}}{{s}^{-1}}{{K}^{-4}} $