This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionCent versus semitone monochord ET.png
English: Cent and semitone (100 cents) size comparison on a monochord, trimmed down to the semitone so the cent is visible. Here distance for 0, 1, 99, and 100 cents should be 0, 0.12, 11.88, and 12. If the semitone (distance between the nut and fingering) is 12 centimeters then the distance from the nut to bridge is about 214 centimeters, or 7 feet.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.