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Skip to the bottom of http://paws.kettering.edu/~drussell/Demos/superposition/supe... and looks what happens when you have 2 notes that are almost, but not quite, the same. That results in very easy to hear "beats", which makes it very easy to tell whether or not you have the same exact note. You don't know which direction you are off, but the slower the beating, the closer you are to being right.

Since most of the energy in a note is at the pitch the note is theoretically at, this is easy to hear when comparing a pure tone to a normal musical instrument with lots of harmonics. Furthermore it is actually somewhat harder to hear it than when you are comparing two musical instruments that both have harmonics, because you get more complications you need to ignore in the harmonics when you're listening for that conflict in the base note.

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