Is it like the visible spectrum and we just can’t physically hear anything else?
What determines the dividing line between each note?
I know this is more than one question but I just don’t understand the science behind music
In: Physics
The dividing line is that when you’ve gone from one A to the next A (A3 to A4, for example), you’ve just doubled the sound wave’s frequency. I.e. you’re playing it an octave higher. Playing a melody in an octave lower or higher will sound the same in the sense that the context of the notes will be the same to each other, and they will “feel” the same. They will just be half or double the frequencies.
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