On the Photoelectric Effect of Sodium-potassium Alloy and its Bearing on the Structure of the Ether

Abstract

2I3while the velocity of electrons emitted under the action of light of smaller or greater wave-length would decrease very rapidly. Some experiments made by E. Ladenburg ' make the theory of explosion or of simple resonance improbable.E. Ladenburg found that the velocity of electrons emitted from plates of platinum, copper and zinc, under the action of ultra-violet light of wave-lengths from 27o -22o pp, increases proportionally to the frequency of the light.

A Direct Determination of "h."

“…The first of the assertions of Einstein's equation has previously been tested with widely varying results by Ladenburg, 1 Kunz, 2 Hughes, 3 Richardson and Compton, 4 and Cornelius. 5 The most satisfactory of these measurements are probably those of Richardson and Compton, though Pohl and Pringsheim 6 do not regard even these as sufficient to distinguish between PD ex: 11 and PD ex: 11 2 , much less to test between any closer relations such as P D ex: 11 and P D ex: 11!, the latter being the relation implied by Lindemann's theory.…”