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Question
What is space wave propagation?
Solution
Space wave propagation: When the radio waves from the transmitting antenna propagate along the space surrounding the earth to reach the receiving antenna, either
directly or after reflection from the ground or in the troposphere, the wave propagation is called Space wave propagation.
RELATED QUESTIONS
Line of sight propagation is also called as_________________ .
(i) Which mode of propagation is used by shortwave broadcast services having frequency range from a few MHz upto 30 MHz? Explain diagrammatically how long distance communication can be achieved by this mode.
(ii) Why is there an upper limit to frequency of waves used in this mode?
In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis?
Explain why ground wave communication mode cannot be used for long-distance communication using high frequencies
State three components of space wave propagation.
The reflected waves from an ionosphere are _____.
(a) ground waves
(b) sky waves
(c) space waves
(d) very high-frequency waves
Four nuclei of an element undergo fusion to form a heavier nucleus, with release of energy. Which of the two – the parent or the daughter nucleus – would have higher binding energy per nucleon?
Explain why this mode cannot be used for long distance communication using high frequencies.
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 sky wave ?
Describe briefly, by drawing suitable diagram, the space wave modes of propagation. Mention the frequency range of the waves in these modes of propagation ?
An em wave is travelling in a medium with a velocity `vecv =vhati` Draw a sketch showing the propagation of the em wave, indicating the direction of the oscillating electric and magnetic fields.
Explain with the help of a diagram how long distance communication can be achieved by ionospheric reflection of radio waves.
Propagation of Electromagnetic Wave?
Answer the following question.
In the skywave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
Name the three different modes of propagation in a communication system. State briefly why do the electromagnetic waves with a frequency range from a few MHz up to 30 MHz can reflect back to the earth. What happens when the frequency range exceeds this limit?
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 frequency range of 3 MHz to 30 MHz is used for ____________.
What do you mean by skip distance?
Explain the ground wave propagation and space wave propagation of electromagnetic waves through space.
The length of half wave dipole at 30MH2 is
The wavelength of electromagnetic wave employed in space communication very over a range of
The radio wave of frequency 300 MHz to 3000 MHz be.long to
An antenna is
Polarization in e.m wave is caused by
The Q of a resonant transmission line is
The characteristic impedance of a coaxial cable is of the order of
The component of the ground wave attenuated by conducting earth is ______.
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 ______.
Two waves A and B of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?
