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Question

A planet radiates heat at a rate proportional to the fourth power of its surface temperature T. If such a steady temperature of the planet is due to an exactly equal amount of heat received from the sun then which of the following statements is true?

A
The planet's surface temperature varies inversely as the distance of the sun
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B
The planet's surface temperature varies directly as the square of its distance from the sun
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C
The planet's surface temperature varies inversely as the square root of its distance from the sun
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D
The planet's surface temperature is proportional to the fourth power of distance from the sun
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