Heat And Thermodynamics

Two bodies \(\mathrm{A}\) and \(\mathrm{B}\) at temperatures '\(\mathrm{T}_1\)' \(\mathrm{K}\) and '\(\mathrm{T}_2\)' \(\mathrm{K}\) respectively have the same dimensions. Their emissivities are in the ratio \(1: 3\). If they radiate the same amount of heat per unit area per unit time, then the ratio of their temperatures \(\left(\mathrm{T}_1: \mathrm{T}_2\right)\) is