/ Dictionary / Index E Einstein's photoelectric equation: Meaning and Definition of Find definitions for: Ein'stein's photoelec'tric equa"tion Pronunciation: [key] — Physics. Physics. the equation that relates the energy of a photoelectron to the difference between the product of the frequency of the incident radiation times Planck's constant and the energy needed to remove the photoelectron from the substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Einstein shift Einstein theory Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language