An 800-KHz Sinusoidal Radio Signal Is Detected at a Point

question 47

Multiple Choice

An 800-kHz sinusoidal radio signal is detected at a point 2.1 km distant from a transmitter tower.The electric field amplitude of the signal at that point is 0.80 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? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,μ₀ = 4π × 10^-7 T ∙ m/A,c = 3.0 × 10⁸ m/s)

• A)8.5 × 10^-4 W/m²
• B)1.2 × 10^-3 W/m²
• C)1.7 × 10^-3 W/m²
• D)6.0 × 10^-4 W/m²
• E)4.2 × 10^-4 W/m²

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Definitions:

Process Costing System

An accounting methodology that accumulates and assigns costs to large volumes of identical or similar units of output.

Direct Materials

Raw materials that are directly traceable to the manufacturing of a specific product.

Journal Entry

A record in the accounting ledger that represents a single transaction and its effect on accounts.

Process Costing System

An accounting method used for homogenous products, allocating production costs based on the processes or departments through which the products pass.