Problem 25.51 16 of 21 Part A Constants | Periodic Table What is the average int

Question

Problem 25.51 16 of 21 Part A Constants | Periodic Table What is the average intensity of its signal at a distance of 260 m from the antenna? A 67 kW radio station broadcasts its signal uniformly in all directions. Express your answer using two significant figures. av-08 mW/m2 SubmitPr ious Answers Request Answer X Incorrect; Try Agairn Part B What is the average intensity of its signal at a distance of 2600 m from the antenna? Express your answer using two significant figures mW/m2 av ttps://session.masteringphysics.com/myct/assignment?assignmentID-5887077

Explanation / Answer

Intensity I = Power/area

Area = 4pir ^2

r is the distance = 260 m

here r = 260 m and P = 67000 W

Iav = 67000/(4pi* 260^2)

Iav = 80 mW/m^2

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at r = 2600 m

again Intensity I = Power/area

Area = 4pir ^2

here r = 2600 m and P = 67000 W

Iav = 67000/(4pi* 2600^2)

Iav = 0.788 mW/m^2 or 0.8 mW/m^2

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