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

question 39

Multiple Choice

An 800-kHz sinusoidal radio signal is detected at a point 6.6 km from the transmitter tower.The electric field amplitude of the signal at that point is 0.780 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 amplitude of the magnetic field of the signal at that point? (ε₀ = 8.85 × 10^-12 C²/N ∙ m²,c = 3.0 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A)

• A)2.6 nT
• B)2.1 nT
• C)1.6 nT
• D)3.1 nT
• E)3.6 nT

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Definitions:

Myelination

The process of coating the axons of neurons with a fatty layer, myelin, which speeds up the transmission of electrical signals in the nervous system.

Myelin Sheaths

The fatty covering that wraps around the axons of many neurons, which helps increase the speed at which electrical impulses propagate along the nerve cells.

Neuron's Axon

The long, slender projection of a neuron that conducts electrical impulses away from the neuron's cell body.

Auditory Cortex

The part of the brain that is responsible for processing auditory information, situated in the temporal lobe and critical for interpreting sounds and language.