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(C) According to the Stefan-Boltzmann law,the power radiated by a black body is given by $P = \sigma A T^4$,where $\sigma$ is the Stefan-Boltzmann con

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$\left(\frac{T_1}{T_2}\right)^2$

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(C) According to the Stefan-Boltzmann law,the power radiated by a black body is given by $P = \sigma A T^4$,where $\sigma$ is the Stefan-Boltzmann constant,$A$ is the surface area,and $T$ is the absolute temperature.For a spherical body,the surface area $A = 4 \pi r^2$.Thus,$P = \sigma (4 \pi r^2) T^4$.Given that both bodies radiate the same power,we have $P_1 = P_2$.Therefore,$\sigma (4 \pi r_1^2) T_1^4 = \sigma (4 \pi r_2^2) T_2^4$.Simplifying the equation,we get $r_1^2 T_1^4 = r_2^2 T_2^4$.Rearranging to find the ratio $\frac{r_2}{r_1}$,we get $\frac{r_2^2}{r_1^2} = \frac{T_1^4}{T_2^4}$.Taking the square root on both sides,we get $\frac{r_2}{r_1} = \sqrt{\frac{T_1^4}{T_2^4}} = \left(\frac{T_1}{T_2}\right)^2$.

$A$. The equation of the polar of $(4, 3)$ with respect to $C$	$I$. $y + 5 = 0$
$B$. The equation of the tangent at $(9, -5)$ on $C$	$II$. $x = 1$
$C$. The equation of the normal at $(-7, -5)$ on $C$	$III$. $3x + 8y = 27$
$D$. The equation of the diameter passing through $(1, -5)$ and $(1, 3)$	$IV$. $x = 9$

Two spherical black bodies have radii $r_1$ and $r_2$. Their surface temperatures are $T_1$ and $T_2$. If they radiate the same power,then $\frac{r_2}{r_1}$ is:

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