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

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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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Verity 4 years 2021-07-27T02:18:05+00:00 1 Answers 13 views 0

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  1. mocmien2
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    2021-07-27T02:19:50+00:00
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    Answer:

     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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