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प्रश्न
Mention three different modes of propagation used in communication system.
उत्तर
Three modes of propagation of electromagnetic waves,
(a) Ground waves,
(b) Sky waves,
(c) Space waves.
Sky wave propagation is used for long distance communication by ionospheric reflection of radio waves.
संबंधित प्रश्न
What is space wave propagation? Which systems of communication use space waves? What is 'radio horizon' of a transmitting antenna of height h? Why is space wave propagation suitable for frequencies above 40 MHz?
Is it necessary for a transmitting antenna to be at the same height as that of receiving antenna for LOS communication ?
Describe briefly, by drawing suitable diagram, the space wave modes of propagation. Mention the frequency range of the waves in these modes of propagation ?
Propagation of Electromagnetic Wave?
Depict the fields diagram of an electromagnetic wave propagating along positive X-axis with its electric field along the Y-axis.
Light from a sodium lamp (S) passes through two polaroid sheets P1 and P2 as shown in fig. What will be the effect on the intensity of the light transmitted (i) by P1 and (ii) by P2 on the rotating polaroid P1 about the direction of propagation of light? Justify your answer in both cases.
The length of half wave dipole at 30MH2 is
An antenna is
In which frequencies range space waves are normally propagate:-
Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication ______.
