Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.
(2) Roundwave Propagation and Skywave Propagation
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. ... line-of-sight propagation, in which radio waves travel in a straight line, the dominant mode at higher frequencies.
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Answer:
(1) Types and features of waves
Waves come in two kinds, longitudinal and transverse. Transverse waves are like those on water, with the surface going up and down, and longitudinal waves are like of those of sound, consisting of alternating compressions and rarefactions in a medium.
(2) Roundwave Propagation and Skywave Propagation
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere. ... line-of-sight propagation, in which radio waves travel in a straight line, the dominant mode at higher frequencies.