On the working of radios and interference of waves driving radios and TVs? It's a well known fact that radios work by ensuring that the resonant frequency of their LCR circuits matches the frequency of the station one is trying to tune into, however, waves also interfere, so how is the radio able to separate or decompose these waves to match the frequencies.
Note:- I don't know much about EM waves, so I'm assuming they behave similarly to sound waves
 A: For a number of reasons information (radio and television signals) is added to a carrier electromagnetic wave produced by a transmitter by a process called modulation.   Perhaps the simplest method is just to switch the carrier wave on and off for certain time periods which relate to sending dots (carrier on for a short time interval) and dashes   (carrier on for a longer time interval) so the information is transmitted as Morse code.
The range of carrier frequencies is enormous, magahertz to gigahertz, and each transmitter sends signals at a particular carrier frequency.
An important idea is that the multitude of carrier waves produced by numerous transmitters overlap with one another (superpose) but whilst overlapping the individual carrier waves do not change their frequency or the information they carry.  So the word interference which is used when describing the overlap of waves in this context is a historical misnomer as the process of overlap does not change the nature of the waves, ie they do not interfere with one another, once the waves have passed through one another they have undergone no change.
A receiver is designed to select a particular carrier wave frequency (eg using a LCR tuned circuit)  in preference to all the other carrier wave frequencies which are around and then extract the information  (radio and television signals) as appropriate.
Interference in the non technical/scientific sense, the degrading of the information, can take a number of forms.  For example: two transmitter might send signals at very similar carrier frequencies such that the receiver cannot select the required signal from the interfering one (co-channel interference); electrical machines, electric storms etc can produce electromagnetic waves over a whole range of frequencies which then degrade the received signal (noise).
Interference in the technical (scientific) sense, the overlap of waves of the same frequency resulting in regions where the waves add together to form a wave of larger amplitude (constructive interference) or smaller amplitude (destructive interference) can occur which can lead to the amplitude of the wave arriving at the receiver varying with time (fading).  One way that this can happen if for the transmitted wave travelling directly to a receiver but also being reflected from an object/region before arriving at the receiver.  The fact that that the is a path distance difference between the direct wave and the reflected wave can result a change in received signal amplitude.
