tom scan x frequency

Hi, is it possible to know the tone of an audio? example, if I record any tone and insert into a track of the audacity it is possible to scan and to know in what frequency this audio is? 440, 400, 1200 Hz, etc.

“Plot Spectrum” will show you the frequency composition of the selected audio:

You should be careful about that. Most musical tones people think of as “one note” are actually collections of different tones.

This is one single piano note.

That’s not a mistake. There really are all those tones in there. The arrangement of those tones (overtones and harmonics) gives you the quality and timber of the note and accounts for the difference in different pianos. When we say that’s “G below middle C”, we usually mean the highest peak or the one furthest to the left.