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Question
High frequency waves follow
High frequency waves follow
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Solution
The correct option is C Ionospheric propagation
The ionosphere is a region extending to around 400km above the earth. In these regions radiation from the Sun causes the molecules to become ionised. The ionisation levels vary at different altitudes and as a result there are what are often termed different layers within the ionosphere. There is ionisation extending across the ionosphere, the layers being peaks in levels of ionisation. Within these regions it is primarily the free electrons that vibrate with the incoming signals and cause them to be refracted or attenuated according to their frequency.
Low frequency signals do not reach the higher ionised regions within the ionosphere(except at night). Hence ionospheric propagation takes place for high frequency waves only.
The ionosphere is a region extending to around 400km above the earth. In these regions radiation from the Sun causes the molecules to become ionised. The ionisation levels vary at different altitudes and as a result there are what are often termed different layers within the ionosphere. There is ionisation extending across the ionosphere, the layers being peaks in levels of ionisation. Within these regions it is primarily the free electrons that vibrate with the incoming signals and cause them to be refracted or attenuated according to their frequency.
Low frequency signals do not reach the higher ionised regions within the ionosphere(except at night). Hence ionospheric propagation takes place for high frequency waves only.
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