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SKY WAVE OR IONOSPHERIC PROPAGATION ?...

SKY WAVE OR IONOSPHERIC PROPAGATION ?

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### Step-by-Step Solution 1. **Understanding the Atmosphere**: - The Earth is surrounded by an atmosphere that extends to about 1000 kilometers. Within this atmosphere, there exists a layer known as the ionosphere. **Hint**: Remember that the ionosphere is a region of the atmosphere that contains ions and free electrons, which play a crucial role in radio wave propagation. 2. **Defining the Ionosphere**: ...
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Knowledge Check

  • As a wave propagates

    A
    the wave intensity remains constant for a plane wave
    B
    the wave intensity decreases as the inverse of the distance from the square for a spherical wave
    C
    the wave intensity decreases as the inversee squre of the distance from the source for a spherical wave
    D
    total intensity of the spherical wave over the spherical of the distance surface centered as the source remains constant at all times

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    Statement-I : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation Statement-II : The refractive index of the ionosphere becomes very high for frequency.

    (A) : Sometimes HF waves can also pass through ionosphere. (R) : The sky wave propagation depends on the vertical angle with which the radio waves are radiated from the antenna.

    Distinguish between Sky wave and Space wave modes of propagation in a communication system.

    Distinguish between Sky wave and Space wave modes of propagation in a communication system.

    Statement-I : Television signals are received through sky-wave propagation Statement-II : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

    Statement-1 surface wave and sky wave can not be observed on moon. Statement-2: Atmosphere of variable refractive index is require for propagation of surface & sky wave.

    (A) : Sky wave is reflected by ionosphere (R) : The reflected wave is out of phase of incident waveand reach the receiving antenna along with the direct wave from transmitting antenna causes in interference.

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