00:01
In this question, we are going to discuss the phenomenon of resonance in a column of air, specifically the column of air inside a soft drink bottle that has different levels of liquid in it at different times.
00:19
So we are looking at what happens to the resonant frequency.
00:28
Oops, let me fix that.
00:37
There we go.
00:40
Resonant frequency as the liquid level decreases.
00:50
Well, as you can see in the illustration, we have one, although my particular soft drink bottle here, has a cap on it, that was not intentional.
01:06
But we can see that as the liquid level decreases, so the length of the air column increases.
01:25
We'll say as the fluid level.
01:28
Now we'll say liquid.
01:29
We want to be very specific with that because in physics air is also a fluid...