(B) According to the Stefan-Boltzmann law,the power radiated by a black body is given by $H = \sigma A T^4$,where $A$ is the surface area of the body.

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$\left(\frac{Q}{4 \pi R^2 \sigma}\right)^{1 / 4}$

(B) According to the Stefan-Boltzmann law,the power radiated by a black body is given by $H = \sigma A T^4$,where $A$ is the surface area of the body.For a star of radius $R$,the surface area is $A = 4 \pi R^2$.Given that the rate of energy production is $Q$,we have $Q = \sigma (4 \pi R^2) T^4$.Rearranging the equation to solve for the temperature $T$:$T^4 = \frac{Q}{4 \pi R^2 \sigma}$.Taking the fourth root on both sides:$T = \left( \frac{Q}{4 \pi R^2 \sigma} \right)^{1/4}$.

Class 11 Chemistry Data Entry - Chemistry Level 0 of all question bank

If the radius of a star is $R$ and it acts as a black body,what would be the temperature of the star,in which the rate of energy production is $Q$? ( $\sigma$ stands for Stefan's constant.)

AIPMT 2012 All AIPMT

A
$\left(\frac{4 \pi R^2 Q}{\sigma}\right)^{1 / 4}$
B
$\left(\frac{Q}{4 \pi R^2 \sigma}\right)^{1 / 4}$
C
$\frac{Q}{4 \pi R^2 \sigma}$
D
$\left(\frac{Q}{4 \pi R^2 \sigma}\right)^{-1 / 2}$

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If the radius of a star is $R$ and it acts as a black body,what would be the temperature of the star,in which the rate of energy production is $Q$? ( $\sigma$ stands for Stefan's constant.)

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In the following circuit,$PN$-junction diodes $D_1, D_2,$ and $D_3$ are ideal. For the following potentials of $A$ and $B$:
$(i) -10 \ V, -5 \ V$
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$(iii) -4 \ V, -12 \ V$
The correct increasing order of resistance between $A$ and $B$ will be: