Why sometimes it seems that i could hear radio frequency when I'm in my room?

Question

not radio station it sounds like a buzz zzzzz just like when you adjust the radio channel,and when there is no channel they will be a zzzzz sound

Answer 1

first of all you can not hear radio frequency. plain radio frequency is inaudible to human ears.
a human ear is only capable of responding to frequencies between 20 to 20,000 Hz.

Radio Frequencies are higher than 20,000 Hz.

The information transmitted through radio waves (sound, image, information) has to go through a process of reception, amplification, demodulation and another stage of amplification to recover the information and become useful to humans.

What you maybe hearing in your room are coming from the ballast of a flourescent lamp(if you have one) or any other electrical or electronics devices that may have transformers, ac motors or relays as these devices may create a humming sound (which you may think sounds like RF) due to the alternating current flowing through them.

Electricity, electronics, radio and audio are broad subjects. But worth studying. So I encourage you to start digging yourself into these very interesting field.

Good luck!

Answer 2

I will assume you mean a radio station since you couldn't hear a radio frequency signal, it is way too high. The most likely reasons are that it is quiet in your room and you are hearing someone playing one of the loud car (or home) systems some distance away or that something in your room resonates with the sound and thus amplifies it. It is also remotely possible that something in your mouth (a filling, crown, etc.) or in the walls has formed a semiconductor junction (like a crystal radio) that can pickup the signals of AM radio and produce a faint sound. There are also sounds of heating and air conditioning and wind that will produce faint sounds that our brain, trying to relate it to something we know, identifies as barely heard voices.