I have few similar questions regarding Radio waves communication particularly FM and AM type of Radio wave communication. Please bear with the naivety of the questions.
Radio waves in FM and AM communications are transmitted through Air and we pick those signals with the help of our receivers.
Assume few FM Radio stations such as 91.1MHz, 93.5MHz and 94.3MHz. (Area size radius - 10-15km)
All these stations are operating simultaneously and depending on what frequency I tune receiver, that radio station is played. But the idea is that all the above 3 radio stations are working and operating simultaneously.
Since the radio waves are EM waves, they propagate in air in the form of waves. So, technically, do these EM Waves propagate through the atmosphere by disturbing the air particles, I mean like, compression and rarefaction? I just want to understand how does these waves move from the transmitter to the receiver.
Question 1 : Do the EM waves travel by creating disturbances in the air particles such as compression and rarefaction?
If they travel like that, won't the compression and rarefaction pattern of the 91.1MHz radio station affect the compression and rarefaction pattern of the 93.5MHz radio station and cause any disturbance/interference/cross-talk between each other before they even reach my receiver? How won't those 2 radio stations interfere between each other ?
Question 2 : What would be typical distance range in terms of radius (in km) of an FM/AM radio station? I tried to find. But unable to find it. Somewhere, I have read that the distance coverage is dependent upon the power of the FM Radio Transmitter? Could someone please throw some more information like a certain table which would provided the distance covered and the radius of coverage of the FM Radio?
Question 3 : If the FM Radio communication are a type of line of sight communication, how am I able to receive the FM Signal even if my receiver is not in direct line of sight of the FM Transmitter?
P.S. The reason why I didn't make it as 3 separate questions because all these questions are very closely related so that I didn't want to burden the answer-er to the question or a similar fellow person who is having the same queries to find the answer under a single question itself.