Question
Download Solution PDFIn which type of propagation, the electromagnetic wave reflection is used
Answer (Detailed Solution Below)
Option 2 : Sky wave mode of propagation
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CT 1: International and National Awards
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8 Mins
Detailed Solution
Download Solution PDFCONCEPT:
- In the field of communication different types of propagation method are used for electromagnetic wave.
- Ground wave propagation: If the radio waves have a frequency less than 2 MHz, then this method is used to communicate from one place to another via earth surface.
- It gives the best efficiency at receiving end.
- Sky wave propagation: If the radio frequency is between 2 MHz to 30 MHz then it can be communicated via sky wave by ionosphere reflection of a wave toward earth.
- This type of propagation is used by short wave broadcast service.
- Ionosphere act as a reflecting surface for this propagation.
- It extends its height from 65 to 400 km above the earth surface.
- Space wave Propagation: It is also known as line-of-sight (LOS) propagation. If the frequency is above 40 MHz then for communication we use this method.
- Space wave is used in line-of-sight as well as space communication.
- Because of LOS type of communication sometimes it is blocked by objects in between.
- Examples are- Television Broadcast, microwave links, satellite communication etc.
- Ground wave propagation: If the radio waves have a frequency less than 2 MHz, then this method is used to communicate from one place to another via earth surface.
EXPLANATION:
- Reflection through different layers of the atmosphere is used in Sky wave mode of propagation.
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