An electric-dipole antenna, broadcasting microwave electromagnetic radiation for

Question

An electric-dipole antenna, broadcasting microwave electromagnetic radiation for mobile communications, is located on the roof of a 129-m-high building and is oriented vertically. Two observers measure the signal strength (radiation intensity) from this antenna. Observer A is on the roof of another building, at the same height as the antenna and at a distance of 1.67 km from it. Observer B is on the street, with a direct-line distance of only 161 m from the antenna. What is the ratio of the signal strength measured by B, IB, to that measured by A, IA? IB/IA =

Explanation / Answer

I = P/4pir^2

IB/IA = (ra)^2/(rb)^2

IB/IA = 107.59

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.