Field Intensity: an 800-KHz Radio Signal Is Detected at a Point

question 22

Multiple Choice

Field intensity: An 800-kHz radio signal is detected at a point 2.7 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.36 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the intensity of the radio signal at that point? (c = 3.00 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 170 µW/m²
• B) 240 µW/m²
• C) 340 µW/m²
• D) 120 µW/m²
• E) 86 µW/m²

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Definitions:

Consumer Income

The total money earned by consumers from all sources, including wages, salaries, investments, and benefits, which impacts their purchasing power.

Price

The amount of money required to purchase a good or service, determined by factors such as supply and demand, production costs, and market competition.

Indifference Schedule

A graphical representation in economics showing different bundles of goods between which a consumer is indifferent.

Willingness

The readiness of a person to engage in a particular action, especially in terms of purchasing goods or services.