text: This person's prediction that displacement squared equals six multiplied by diffusivity multiplied bytime in random walks was used by Jean Perrin to measure Avogadro's number.
full_question: This person's prediction that displacement squared equals six multiplied by diffusivity multiplied bytime in random walks was used by Jean Perrin to measure Avogadro's number. The proportionalityconstants for the rates of spontaneous and stimulated emission are named for this person. This scientistshowed that, as temperature goes to infinity, heat capacity goes to 3R, if a solid is modeled as a lattice ofindependent (*) springs with quantized vibrations. This physicist also showed that light energy is quantized intophotons in a Nobel Prize-winning description of the photoelectric effect. The fourth of his Annus mirabilis paperspublished in 1905 introduced mass-energy equivalence. For 10 points, name this German physicist who proposedthat E equals m times c squared.
first_sentence: This person's prediction that displacement squared equals six multiplied by diffusivity multiplied bytime in random walks was used by Jean Perrin to measure Avogadro's number.
raw_answer: Albert Einstein