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SKY WAVE OR IONOSPHERIC PROPAGATION...

SKY WAVE OR IONOSPHERIC PROPAGATION

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Sky Wave Propagation : When the radiowaves from the transmitting antenna reach the receiving antenna after reflection in the ionoshpere, the wave propagation is called sky wave propagation
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Knowledge Check

  • Statement 1: Sky wave communication is not used to transmit TV signals Statement 2: The ionosphere does not reflect TV signals, it transmits tham.

    A
    Both Statement-1 and Statement-2 are true, and Statement-2 is the correct explanation of Statement-1.
    B
    Both Statement-1 and Statement-2 are true but Statement -2 is not the correct explanation of Statement-1
    C
    Statement-1 is true but Statement-2 is false.
    D
    Statement-1 is false but Statement-2 is true.

  • As a wave propagates

    A
    the wave intensity remains constant for a plane wave
    B
    the wave intensity decrease as the inverse square of the distance frome the source for a spherical wave
    C
    the wave intensity decrese as the inverse of the distance frome a line source
    D
    total power of the spherical wave over the spherical surface centred at the source remains constant at all the times

  • As a wave propagates,

    A
    (a) the wave intensity remains constant for a sine wave
    B
    (b) the wave intensity decreases as the inverse of the distance from the source for a spherical wave
    C
    (c ) the wave intensity decreases as the inverse square of the distance from the source for a spherical wave
    D
    (d) total intensity of the spherical wave over the spherical surface centered at the source remains constant at all times.

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    Assertion: Television signals are recieved throgh sky-wave propagation. Reason: The ionosphere reflects em wave of frequencies greater than a critical frequency.

    Assertion : Electromagentic waves with frequencies more than the cirtical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency .

    Assertion: Em wave with frequencies more than the critical frequency of ionosphere cannot be used for communication using sky-wave propagation. Reason: The refractive index of the ionosphere becomes very high for frequencies higher than the crtical frequency.

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