Resonance frequency and Natural frequency?? Say there is an empty bottle of coke., and you know for sure that the bottle resonates most at 320hz. when the bottle resonates, the bottle will vibrate. the question is, 1.if the bottle also resoates at 318hz( bu not most), will the bottle vibrate 318 times per second or 320times per second.? 2.What is the difference between resonance frequency and resonance frequency?? Aren't they basically the same??