Answer:
The ratio of a photon's energy to its frequency.
Anwer2: Planck's Constant represents the Photon Potential Energy and more!
Planck's Energy E= hf=hc/r = zQ2c/r = WQc/r is the key to Planck's constant.
Here Planck's Constant represents the Photon Charge, h= zQ2 =QW.
Q is Photon Electric Charge and W is the Photon Magnetic Charge in Webers and z is the free space resistance , 375 Ohms.
Planck's Constant h = zQ2, where z is the free space resistance and Q is the Photon Electric Charge. The free space resistance is 375 Ohms. The free space resistance and Planck's Constant are related; z=W/Q and h=WQ. W and Q are the fundamental constants of Quantum Theory. Knowing both z and h the values of W and Q can be found. W = 500 E-18 Webers(volt seconds) and Q= 4/3 E-18 Coulombs.
The Photon Charge Q is related to the Fine Structure Constant Alpha:
Alpha = e2z/2h = 1/2 (e/Q)2 = 7.2E-3 where e is the electron charge.
The Fine Structure Constant relates the Photon Charge to the Electron Charge.
The Photon Charge has the same charge as 2 U quarks 2x2/3 and is 8 1/3 electrons.
Planck's constant times c the speed of light, hc, represents the fundamental Charge quantity in the Universe, and Potential Charge Energy E= - hc/r and GmM is the fundamental Matter quantity in the Universe and Potential Matter Energy E = -GmM/r.