When a tuning fork is struck I hear two tones. From a distance I can hear a high octave frequency of the pitch of the tuning fork. Though, if I listen to it closely (closer to my ears), I also hear a lower octave frequency of the pitch of the tuning fork. I want to clarify that what I'm hearing is correct.
Also, is there something about “pure tones” that produces this effect, and if so what are the harmonics of a pure tone/tuning fork? Just from brief reading on the topic, I’ve seen it said that tuning forks' overtone(s) (I'm assuming there is only one overtone) ring out quickly. Then why am I hearing a high octave version of the fork's pitch and a low octave version of the forks pitch until it rings out?