Match the following Column I with Column II. Column ! Column...

Match the following Column I with Column II. Column ! Column II Space communications Frequencies I. Ground wave propagation A. $30 \mathrm{MHz}$ to $300 \mathrm{MHz}$ II. Sky wave propagation B. $80 \mathrm{MHz}$ to $200 \mathrm{MHz}$ III. Space wave propagation C. $2 \mathrm{MHz}$ to $30 \mathrm{MHz}$ IV. Television signal D. $500 \mathrm{kHz}$ to $1500 \mathrm{kHz}$ propagation Code (a) $1-\mathrm{D}, \mathrm{II}-\mathrm{C}_{4} \mathrm{III}-\mathrm{A}, \mathrm{IV}_{-\mathrm{B}}$ (b) $1-\mathrm{A}, 11-B$, III-C, IV-D (c) I-B, II-A, III-D, IV-C (d) 1-C, II-D, III-B, IV-A

Match the following Column I with Column II.
Column ! Column II Space communications Frequencies
I. Ground wave propagation A. $30 \mathrm{MHz}$ to $300 \mathrm{MHz}$
II. Sky wave propagation
B. $80 \mathrm{MHz}$ to $200 \mathrm{MHz}$
III. Space wave propagation
C. $2 \mathrm{MHz}$ to $30 \mathrm{MHz}$
IV. Television signal
D. $500 \mathrm{kHz}$ to $1500 \mathrm{kHz}$
propagation
Code
(a) $1-\mathrm{D}, \mathrm{II}-\mathrm{C}_{4} \mathrm{III}-\mathrm{A}, \mathrm{IV}_{-\mathrm{B}}$
(b) $1-\mathrm{A}, 11-B$, III-C, IV-D
(c) I-B, II-A, III-D, IV-C
(d) 1-C, II-D, III-B, IV-A

Key Concepts

Television Signal Propagation

Television signal propagation refers to the transmission of television broadcasts within designated frequency ranges. Typically carried by space waves, these signals are engineered for line-of-sight reception, ensuring that broadcasts reach their intended audience reliably.

Space Wave Propagation

Space wave propagation is the transmission of radio waves in a direct line-of-sight path, through the earth's atmosphere or outer space. This method is primarily used at higher frequencies where the waves travel mainly in straight lines, making it suitable for services like television broadcasting and satellite communications.

Frequency Allocation

Frequency allocation involves designating specific frequency ranges for various applications in telecommunications. Different propagation modes are effective in distinct frequency bands, and understanding these bands is crucial for optimizing communication systems and avoiding interference.

Ground Wave Propagation

Ground wave propagation refers to the transmission of radio waves along the surface of the Earth. This mode is effective at lower frequencies, where the wave can follow the curvature of the Earth, allowing communication over longer distances even when direct line-of-sight is not available.

Sky Wave Propagation

Sky wave propagation involves radio waves that are directed towards the ionosphere and are reflected back to the Earth. This mechanism is especially important in long-distance communications, as it enables signals to cover areas well beyond the horizon.

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