For 10 points, name this quantity equal to Planck's constant divided by momentum which represents the wavelength of a particle's matter wave.
The translational partition function of a single particle in a container is equal to the volume of the container divided by the cube of this quantity. The SackurTetrode equation only applies when the density of particles times this quantity cubed is much less than one. For an ideal gas, one form of this quantity is equal to Planck's constant divided by the square root of quantity two pi times mass times Boltzmann's constant times temperature. (*) The energy of a particle is equal to 1240 electron volt-nanometers divided by this quantity for the particle. The existence of this quantity was confirmed by an experiment which fired electrons at a nickel target and observed a Bragg diffraction pattern; that experiment was conducted by Davisson and Germer. For 10 points, name this quantity equal to Planck's constant divided by momentum which represents the wavelength of a particle's matter wave.
The translational partition function of a single particle in a container is equal to the volume of the container divided by the cube of this quantity.
de Broglie wavelength (accept thermal wavelength or thermal de Broglie wavelength before "electrons"; prompt on "wavelength" before mentioned; "wavelength" unnecessary after mentioned)