If decay rate is related to the elements composition (seems to be true), and the forces holding elements together include Electromagnetism and the Lorentz Force

If decay rate is related to the elements composition (seems to be true), and the forces holding elements together include Electromagnetism and the Lorentz Force which also seems to be true, then yes. [https://en.m.wikipedia.org/wiki/Classical_electromagnetism_and_special_relativity#:~:text=The%20theory%20of%20special%20relativity,frame%20of%20reference%20to%20another https://en.m.wikipedia.org/wiki/Classical_electromagnetism_a....] See also [https://en.m.wikipedia.org/wiki/Electromagnetic_four-potential https://en.m.wikipedia.org/wiki/Electromagnetic_four-potenti...] Notably, light is a form of electromagnetism, so this shouldn’t be as surprising as it is. c is an explicit part of many formulas, interestingly. And electromagnetism was the first thing tackled in special relativity.