What is the average value of the magnitude of the Poynting vector S at 1 meter from a 100-watt lightbulb radiating in all directions

Question

What is the average value of the magnitude of the Poynting vector S at 1 meter from a 100-watt lightbulb radiating in all directions

in progress 0
Adela 5 years 2021-07-31T05:28:03+00:00 1 Answers 150 views 0

Answers ( )

  1. thugiang
    0
    2021-07-31T05:29:56+00:00
    Reply

    Answer:

    The value  is   S = 7.96

    Explanation:

    From the question we are told that

           The  power is  P = 100 \ W

           The radius  is  r = 1 \ m

       

    Generally the average value of the magnitude of the Poynting vector is mathematically represented

              S = \frac{P}{4 \pi r^2}

       =>    S = \frac{ 100 }{ 4 *3.142 *1^2 }

      =>     S = 7.96

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )