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

question 49

Multiple Choice

Field intensity: An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. The electric field amplitude of the signal at that point is 0.63 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 magnetic field amplitude of the signal at that point? (c = 3.0 × 10⁸ m/s, μ₀ = 4π × 10^-7 T ∙ m/A, ε₀ = 8.85 × 10^-12 C²/N ∙ m²)

• A) 2.1 nT
• B) 1.7 nT
• C) 1.3 nT
• D) 2.5 nT
• E) 2.9 nT

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Definitions:

SUDs

Substance Use Disorders, conditions characterized by the harmful or hazardous use of psychoactive substances, including alcohol and illicit drugs.

ASAM

The American Society of Addiction Medicine, an organization dedicated to increasing access to and improving the quality of addiction treatment, educating physicians, and promoting research in the field.

Withdrawal Management

Maneuvers or interventions used to help individuals safely reduce or eliminate dependence on addictive substances, often involving medical and psychological support.

Ambulatory Withdrawal

The process of experiencing withdrawal symptoms while not being hospitalized, often managed through outpatient treatment services.