149496 Shown below are the black body radiation curves at temperatures $T_{1}$ and $T_{2}\left(T_{2}>T_{1}\right)$. Which of the following plots is correct?

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149492 Assertion: Bodies radiate heat at all temperatures.
Reason: Rate of radiation of heat is proportional to the fourth power of absolute temperature.

149497 Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increase by a factor of :

149498 A black body, at a temperature of $227^{\circ} \mathrm{C}$, radiates heat at a rate of $20 \mathrm{cal} \mathrm{m}^{-2} \mathrm{~s}^{-1}$. When its temperature is raised to $727^{\circ} \mathrm{C}$, the heat radiated by it in cal $\mathrm{m}^{-2} \mathrm{~s}^{-1}$ will be closest to :

149496 Shown below are the black body radiation curves at temperatures $T_{1}$ and $T_{2}\left(T_{2}>T_{1}\right)$. Which of the following plots is correct?

1

2

3

4

149492 Assertion: Bodies radiate heat at all temperatures.
Reason: Rate of radiation of heat is proportional to the fourth power of absolute temperature.

149497 Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increase by a factor of :

149498 A black body, at a temperature of $227^{\circ} \mathrm{C}$, radiates heat at a rate of $20 \mathrm{cal} \mathrm{m}^{-2} \mathrm{~s}^{-1}$. When its temperature is raised to $727^{\circ} \mathrm{C}$, the heat radiated by it in cal $\mathrm{m}^{-2} \mathrm{~s}^{-1}$ will be closest to :

149496 Shown below are the black body radiation curves at temperatures $T_{1}$ and $T_{2}\left(T_{2}>T_{1}\right)$. Which of the following plots is correct?

1

2

3

4

149492 Assertion: Bodies radiate heat at all temperatures.
Reason: Rate of radiation of heat is proportional to the fourth power of absolute temperature.

149497 Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increase by a factor of :

149498 A black body, at a temperature of $227^{\circ} \mathrm{C}$, radiates heat at a rate of $20 \mathrm{cal} \mathrm{m}^{-2} \mathrm{~s}^{-1}$. When its temperature is raised to $727^{\circ} \mathrm{C}$, the heat radiated by it in cal $\mathrm{m}^{-2} \mathrm{~s}^{-1}$ will be closest to :

149496 Shown below are the black body radiation curves at temperatures $T_{1}$ and $T_{2}\left(T_{2}>T_{1}\right)$. Which of the following plots is correct?

1

2

3

4

149492 Assertion: Bodies radiate heat at all temperatures.
Reason: Rate of radiation of heat is proportional to the fourth power of absolute temperature.

149497 Suppose the sun expands so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it then will increase by a factor of :

149498 A black body, at a temperature of $227^{\circ} \mathrm{C}$, radiates heat at a rate of $20 \mathrm{cal} \mathrm{m}^{-2} \mathrm{~s}^{-1}$. When its temperature is raised to $727^{\circ} \mathrm{C}$, the heat radiated by it in cal $\mathrm{m}^{-2} \mathrm{~s}^{-1}$ will be closest to :