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Author Question: How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the ... (Read 90 times)

jparksx

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on: Jul 28, 2018
How much electromagnetic energy is contained in each cubic meter near the Earth's surface if the intensity of sunlight under clear skies is 1 000 W/m2?
 a. 3.3  10-6 J
  b. 3.3 J
  c. 0.003 J
  d. 10-4 J
  e. 3.0  105 J

Question 2

A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
 a. 8  10-5 W/m2
  b. 8  10-6 W/m2
  c. 3  10-3 W/m2
  d. 0.8 W/m2
  e. 2.5  10-5 W/m2


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macmac

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Reply #1 on: Jul 28, 2018
Answer to Question 1

A

Answer to Question 2

A


jparksx

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Reply 2 on: Jul 28, 2018
Excellent

mohan

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Reply 3 on: Yesterday
Wow, this really help

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