"String theory provides a theoretical framework in which all particles, from photons to quarks, are one-dimensional strings as opposed to zero-dimensional points. If a version of string theory were found that held up in all contexts, it would serve as a single mathematical model for describing the nature of the universe—a “theory of everything” that would replace the Standard Model of physics, which does not explain gravity."
https://www.masterclass.com/articles/string-theory-explained
"Although no one had succeeded in merging general relativity and quantum mechanics, preliminary work had established that such a union would require precisely the massless particle predicted by string theory. A few physicists argued that string theory, by having this particle built into its fundamental structure, had united the laws of the large (general relativity) and the laws of the small (quantum mechanics)."
https://www.britannica.com/science/string-theory
"Electromagnetic radiation can be described in terms of a stream of mass-less particles, called photons, each traveling in a wave-like pattern at the speed of light. Each photon contains a certain amount of energy. The different types of radiation are defined by the the amount of energy found in the photons"
https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html
"String theory is the idea in theoretical physics that reality is made up of infinitesimal vibrating strings, smaller than atoms, electrons or quarks."
https://www.space.com/17594-string-theory.html
"The strings of string theory are stupendously small, thought to be somewhere around the Planck scale, a bare 10^-34 meters across. That's far, far smaller than anything we can possibly hope to probe even with our most precise instruments"
https://www.space.com/putting-string-theory-to-test.html
"The second universal law, the law of vibration, posits that everything (every atom, object, and living thing) is in constant motion, vibrating at a specific frequency."
https://www.mindbodygreen.com/articles/law-of-vibration
"a resonant frequency is a natural frequency of vibration determined by the physical parameters of the vibrating object."
http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/reson.html