Which of the law can be understood in terms of Stefan's law

Options

A. Wien's displacement law
B. Kirhoff's law
C. Newton's law of cooling
D. Planck's law

Answer

C

Explanation

For small temperature difference, Stefan's law can written as
`Deltau = e sigmaA [(T +DeltaT)^(4) -T^(4)]`
or `Deltau = e sigma AT^(4) [[1+(DeltaT)/(T)]^(4)-1]`
or `Deltau = e sigma AT^(4) xx 4 xx (DeltaT)/(T)`
or `Delta u prop DeltaT`
Hence Newton's law of cooling is a special case of stefan's law.