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25 March, 08:55

A space probe 2.0 * 1010 m from a star measures the total intensity of electromagnetic radiation from the star to be 5.0 * 103 W>m2. If the star radiates uniformly in all directions, what is its total average power output

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  1. 25 March, 11:46
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    P = 1.0 10¹⁴ W

    Explanation:

    Radiation intensity is the power radiated by unit area,

    I = P / A

    As the star radiates uniformly, the radiation expands into a sphere, the area of this sphere is

    A = 4π R²

    Let's replace

    P = I (4π R²)

    Let's calculate the power

    P = 5.0 10³ 2.0 10¹⁰

    P = 1.0 10¹⁴ W

    This is the power radiated by the star
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