Physics - Heat & Thermo Question with Solution | TestHub

Two electric lamps A and B radiate the same power. Their filaments have the same dimensions and have emissivities ${\mathrm{e}}_{\mathrm{A}}$ and ${\mathrm{e}}_{\mathrm{B}}$. Their surface temperatures are ${\mathrm{T}}_{\mathrm{A}}$ and ${\mathrm{T}}_{\mathrm{B}}$. The ratio $\frac{{\mathrm{T}}_{\mathrm{A}}}{{\mathrm{T}}_{\mathrm{B}}}$ will be equal to :(A) ${\left(\frac{{\mathrm{e}}_{\mathrm{B}}}{{\mathrm{e}}_{\mathrm{A}}}\right)}^{1/4}$