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    Question

    A black body at temperature 500 K emits radiation. If

    its temperature is doubled, by what factor does its emitted power increase?
    A 2 Correct Answer Incorrect Answer
    B 4 Correct Answer Incorrect Answer
    C 8 Correct Answer Incorrect Answer
    D 16 Correct Answer Incorrect Answer

    Solution

    According to Stefan-Boltzmann law, the power emitted by a black body is proportional to the fourth power of temperature: P ∝ T4 If T is doubled:

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