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:

Personal Growth

The process of improving self-awareness, developing talents, enhancing the quality of life, and contributing to the realization of dreams and aspirations.

Transference

A phenomenon in psychoanalysis where patients project feelings about figures from their past onto their therapist.

Psychoanalysis

A therapeutic technique and theory of personality developed by Sigmund Freud that emphasizes unconscious motivations and conflicts, and the importance of childhood experiences.

Transference

In psychotherapy, it's the phenomenon where clients project feelings and attitudes from a past relationship onto the therapist.