Line-of-sight communication happens by means of :
Ground wave
Sky wave
Surface wave
Space wave
Seismic wave
The Correct Option is D
Approach Solution - 1
Given:
- Line-of-sight communication methods.
Step 1: Identify Correct Wave Type
Line-of-sight communication uses space waves, which travel directly from transmitter to receiver (e.g., TV, FM radio, satellite signals).
Conclusion:
The correct answer is (D) Space wave.
Approach Solution -2
1. Understand line-of-sight communication:
Line-of-sight communication requires a direct, unobstructed path between the transmitter and receiver. This is because the transmitted waves travel in a straight line.
2. Analyze the wave propagation modes:
- Ground wave: Follows the Earth's curvature and can travel beyond the horizon. Not strictly line-of-sight.
- Sky wave: Refracted by the ionosphere and can travel long distances. Not line-of-sight.
- Surface wave: Travels along the Earth's surface. Can be partially line-of-sight but also diffracts.
- Space wave: Travels directly from transmitter to receiver. This is the primary mode for line-of-sight communication.
- Seismic wave: Travels through the Earth. Not used for communication.
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Concepts Used:
Waves
Waves are a disturbance through which the energy travels from one point to another. Most acquainted are surface waves that tour on the water, but sound, mild, and the movement of subatomic particles all exhibit wavelike properties. inside the most effective waves, the disturbance oscillates periodically (see periodic movement) with a set frequency and wavelength.
Types of Waves:
Transverse Waves -
Waves in which the medium moves at right angles to the direction of the wave.
Examples of transverse waves:
- Water waves (ripples of gravity waves, not sound through water)
- Light waves
- S-wave earthquake waves
- Stringed instruments
- Torsion wave
The high point of a transverse wave is a crest. The low part is a trough.
Longitudinal Wave -
A longitudinal wave has the movement of the particles in the medium in the same dimension as the direction of movement of the wave.
Examples of longitudinal waves:
- Sound waves
- P-type earthquake waves
- Compression wave