Advertisements
Advertisements
प्रश्न
The reflected waves from an ionosphere are _____.
(a) ground waves
(b) sky waves
(c) space waves
(d) very high-frequency waves
उत्तर
sky waves
APPEARS IN
संबंधित प्रश्न
Write a short note on surface wave propagation of electromagnetic waves.
What is space wave propagation?
The outermost layer of the earth’s atmosphere is _______.
(A) stratosphere
(B) mesospher
(C) troposphere
(D) ionosphere
What is space wave propagation?
State the factors which limit its range of propagation
What is ground wave communication?
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?
Name the three different modes of propagation of electromagnetic waves. Explain, using a proper diagram the mode of propagation used in the frequency range from a few MHz to 40 MHz.
Mention three different modes of propagation used in communication system.
Explain with the help of a diagram how long distance communication can be achieved by ionospheric reflection of radio waves.
In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
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?
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 Q of a resonant transmission line is
In which frequencies range space waves are normally propagate:-
Propagation constant of a 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 ______.
