Explain space wave propagation. - Vidyadip

Question

Explain space wave propagation.

✓

Answer

i. When the radio waves from the transmitting antenna reach the receiving antenna either directly along a straight line (line of sight) or after reflection from the ground or satellite or after reflection from troposphere, the wave propagation is called space wave propagation.
ii. The radio waves reflected from troposphere are called tropospheric waves.
iii. Radio waves with frequency greater than 30 MHz can pass through the ionosphere (60 km – 1000 km) after suffering a small deviation. Hence, these waves cannot be transmitted by space wave propagation except by using a satellite.
iv. Also, for TV signals which have high frequency, transmission over long distance is not possible by means of space wave propagation.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Answer the following in Detail" from Electromagnetic Waves and Communication System→Electromagnetic Waves and Communication System — all question types→Physics STD 11 Science question papers→Maharashtra Board STD 11 Science question papers→Maharashtra Board question paper generator→

Similar questions

Find the total energy and binding energy of an artificial satellite of mass $1000 \ kg$ orbiting at height of $1600 \ km$ above the Earth’s surface.
$($Given: $G = 6.67 \times 10^{-11} N m^2/kg^2, R = 6400 \ km, M = 6 \times 10^{24} \ kg)$

A monochromatic ray of light is incident at $37^\circ $ on an equilateral prism of refractive index $3/2$. Determine angle of emergence and angle of deviation. If angle of prism is adjustable, what should its value be for emergent ray to be just possible for the same angle of incidence.

DC current flows in a metal piece of non uniform cross-section. Which of these quantities remains constant along the conductor: current, current density or drift speed?

Calculate the velocity of $EM$ waves in vacuum.

A metal sphere cools at the rate of $0.05^{\circ} C / s$ when its temperature is $70^{\circ} C$ and at the rate of $0.025^{\circ} C / s$ when its temperature is $50^{\circ} C$. Determine the temperature of the surroundings and find the rate of cooling when the temperature of the metal sphere is $40^{\circ} C$.

Explain flow of current in different conductor.

Power is rate of doing work or the rate at which energy is supplied to the system. A constant force F is applied to a body
of mass m. Power delivered by the force at time t from the start is proportional to
(a) $t$
(b)$t^2$
(c) $\sqrt{t}$
(d) $t ^0$
Derive the expression for power in terms of $F, m$ and $t$.
[Ans: $p =\frac{F^2 t}{m}, \therefore p \propto t$ ]

How are radio waves produced? State their properties and uses.

Explain working of a circuit when connected to emf device.

Explain applications of semiconductors.