In cgs units, the fine structure constant can be written as the square of the elementary charge over the product of the speed of light and one form of this quantity.
A constant of proportionality in the Josephson effect equals twice the elementary charge divided by this quantity. In cgs units, the fine structure constant can be written as the square of the elementary charge over the product of the speed of light and one form of this quantity. The de Broglie wavelength of a particle equals this quantity (*) divided by the particle's momentum, and the energy of a photon equals this quantity times its frequency. Dirac's constant equals this quantity divided by two pi, and is also called the reduced version of it. For 10 points, identify this constant approximately equal to six point six times ten to the negative thirty-four joule-seconds, usually denoted h and named for a physicist who discovered the correct law of blackbody radiation.
A constant of proportionality in the Josephson effect equals twice the elementary charge divided by this quantity.
Planck\'s constant [prompt on h, accept h bar until the end of the clue about deBroglie wavelength]