In $MKS$ system, Stefan's constant is denoted by $\sigma $. In $CGS$ system multiplying factor of $\sigma $ will be
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(b) In $M.K.S.$ system unit of $\sigma $ is $\frac{J}{{{m^2} \times sec \times {K^4}}}$
==> $1\frac{J}{{{m^2} \times sec \times {K^4}}} = \frac{{{{10}^7}erg}}{{{{10}^4}c{m^2} \times sec \times {K^4}}}$
$ = {10^3}\frac{{erg}}{{c{m^2} \times sec \times {K^4}}}$
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