Applying a Fourier transform on wavefunctions in position space gives the eigenfunctions of the operator named for this quantity.
The relativistic kinetic energy of a photon equals this quantity times the speed of light. Applying a Fourier transform on wavefunctions in position space gives the eigenfunctions of the operator named for this quantity. Dropping a Galilean cannon, a stack of balls with a large ball at the bottom and a small ball on top, demonstrates this quantity's conservation. There is a limit to how accurately this property and position can be measured, according to Heisenberg's uncertainty principle. Newton's second law equates the time derivative of this quantity to force, so it is always conserved in the absence of external forces. For 10 points, name this quantity defined as mass times velocity.
The relativistic kinetic energy of a photon equals this quantity times the speed of light.
linear momentum [do not accept or prompt on “angular momentum”; prompt on p]