What is the difference between note and tone?
Both note and tone are terms used in music rather than physics. Both refer to the pitch of the sound but in music they include other information also. As far as physics is concerned all 3 terms mean essentially the same thing : a sound of a particular frequency.
In music, notes are usually identified by letter - eg middle C - instead of frequency (261.6 Hz). The term can also refer to duration - eg crotchet, quaver, minim. Tone also refers to the quality or timbre of the sound.
A tone played by a musical instrument - or even an electronic instrument - is rarely a single pure frequency. It usually includes overtones which are multiples of the fundamental frequency. The relative strength of the different overtones compared with the fundamental gives the tone its quality. Quality describes the difference between the same note played by different instruments, also by the same instrument under different conditions.