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

Evaluate the effects of immigration laws and policies on the racial and ethnic diversity of the United States.

Understand the changing significance of race in the United States.

Identify and analyze the formation and impact of ethnic enclaves.

Examine the differing viewpoints on race-specific policies, such as affirmative action.

---

Definitions:

Repression

A defense mechanism proposed by Freud, which involuntarily pushes threatening or disturbing thoughts out of conscious awareness.

Source Amnesia

A memory disorder in which someone can remember certain information but is unable to recall where, when, or how that information was acquired.

Proactive Interference

The phenomenon where old memories inhibit the capacity to remember new information.

Retrieval Cues

Stimuli or prompts that aid the recall of information stored in memory.