I noticed my reputation was nanometres from 68, so I decided to add an extra video from yesterday's vibrationary experiment.
The basic principle I was over-explaining was that strings vibrate, and when you divide the length of the string, they vibrate at equally divisible rates. If you half the length of a plucked string, it vibrates twice as fast. If you quarter it - four times faster.
This then translates to different pitches as the vibrations of the string move the air around and create certain wavelengths.
Halving the string makes a 2:1 ratio. A third length gives you a 3:2 ratio (3 vibrations for every 2 at full length) and so on.
Here is a second demonstration of the 2:1 ratio. As you may notice - especially if you can keep a beat - when I slam my finger down on fret 12 - the halfway point - the string immediately doubles its frequency.
Using the same dumbed-down math I had to use in the previous post because I'm dumb, you can then figure out the pitch of the guitar string without even hearing it.
You may also note that the light is flickering, which is quite normal depending on the lights. In this case, it's coming from my lava lamp incandescent bulb which I had pointed at the guitar to illuminate for the low-quality slow-mo.
An incandescent bulb typically flickers at double the frequency of the AC Frequency. So if your country's AC is 50Hz like here in China, the bulb will flicker at a rate of 100Hz.
The flickering in the video is going at a rate of 185bpm, or about 3.083333 flickers per second at this slowed pace.
Multiplying to real-time according to my previous post by about 32.4 - according to the frame rate of the video playback, and you get...
