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**Wave Propagation.** Fundamentals of wave propagation; transverse waves on strings and membranes; compressional, torsional, and flexural waves in rods and plates; longitudinal, shear, and surface waves in elastic media; tube waves; and water waves.

**Wave Propagation**

Propagation or direction of a wave in different directions to provide a specified path is known as wave propagation.

**Types of waves:**

**Ground waves:**Ground waves are also known as electromagnetic0 waves those are refered to as refer to propagation of radio waves parallel to and adjacent to the surface of the Earth, following the twist of the Earth. They are mostly strong because they pass near to the ground of lower than 2 mega hrtz, thus increasing the wavelength.**Ionosphere waves:**The ionosphere is a portion of upper areas of the world’s atmosphere largely as a result of being paid ultraviolet radioactivity from the sun, even though other sources, such as interplanetary rays, also underwrite.**Sky waves:**The energy released by an probe, that is sky surge, would be unexploited liveliness as far as wireless communication is disturbed if it is continued on its track and did not return to world but under confident surroundings it is imitated from the ionosphere.

And many other types of waves which consider plazma frequency, critical frequency, maximum frequency, fading zone, radio horizon, space waves and super refraction and reflection of waves.

**Wave Propagation **

Wave propagation is the integral part of the physics that represents the way in which waves travel i.e. movement of waves. It supports different types of wave propagation like Ground Waves, Ionospheric Layer, Ionospheric Wave, Plasma Frequency, Critical Frequency, Maximum Usable Frequency, Broadcast Fading Zone, Space Waves and Troposphere Scatter Propagation etc.

Wave is a vibration in time and space that carries energy. Wave propagation refers to the physics term in which waves travel. Wave speed, intensity and wave velocity are the major concept of wave propagation. If waves move, then they should have a speed. Wave speed depends on the material through which the waves travel. Intensity refers to the energy flow through a particular area in a given time. Wave velocity refers to the signal velocity, phase velocity, group velocity and front velocity.

There are three types of wave propagation which are given as below:

- Ground wave propagation – it is a method of radio frequency propagation for transmission which use the area between the ionosphere and the surface of the earth. It is used to provide local radio communications coverage.
- Space wave propagation – Radio waves with high frequency is termed as space wave propagation. It is also known as tropospherical propagation because these waves can be travel from earth surface to troposphere.
- Sky wave propagation – it refers to the radio wave propagation via ionosphere. Each reflection through the ionosphere is called hop. It can include the multiple hops between ionosphere and earth.

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