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Chapter 20: Problem 2685

The electromagnetic waves of frequency \(2 \mathrm{MHz}\) to \(30 \mathrm{MHz}\) are (A) in ground wave propagation (B) in sky wave propagation (C) in micro wave propagation (D) in satellite communication

Short Answer

Expert verified
The electromagnetic waves with a frequency of 2 MHz to 30 MHz correspond to sky wave propagation. So, the correct answer is (B) in sky wave propagation.

Step by step solution

01

Recall the frequency ranges for different propagation modes

For this exercise, we should recall the typical frequency ranges associated with different modes of propagation: 1. Ground wave propagation: below 2 MHz 2. Sky wave propagation (also known as Ionospheric propagation): 2 MHz to 30 MHz 3. Microwave propagation: 1 GHz to 300 GHz 4. Satellite communication: frequencies overlapping microwaves, but typically above 1 GHz
02

Check the given frequency range against each mode of propagation

The given frequency range is 2 MHz to 30 MHz. We compare this range with the frequencies associated with different modes of propagation mentioned earlier. 1. Ground wave propagation is below 2 MHz, so it doesn't fall within our given range. 2. Sky wave propagation is from 2 MHz to 30 MHz, which matches our given range. 3. Microwave propagation is from 1 GHz to 300 GHz, so it doesn't fall within our given range. 4. Satellite communication typically occurs at frequencies above 1 GHz, so it doesn't fall within our given range.
03

Identify the correct mode of propagation

Based on the frequency range associated with each mode of propagation, we can conclude that the electromagnetic waves with a frequency of 2 MHz to 30 MHz correspond to sky wave propagation. So, the correct answer is (B) in sky wave propagation.

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