The History of the Photoelectric Effect
        
1887     Hertz serendipitously discovers the photoelectric effect
        
1889     J. J. Thomson experimentally proves that ultraviolet-irradiated metals 
	    emit particles with the same charge-to-mass ratio as the electron
        
1902     Lenard experimentally discovers that:
        
		(1) the kinetic energy of the released electron is independent
                    of the intensity of the light used
        
		(2) the kinetic energy of the released electron increases with
                    an increase in the frequency of light
        
                (The functional relationship between the variables remained 	   
                  undetermined, however).
        
1905     Einstein explains the photoelectric effect by proposing that light comes in 
	    quantized lumps of energy (now called photons).
        
	    He predicts that:
        
                (1)  electron energy E varies linearly with the frequency f of light used
        
                (2)  the slope of an E-vs-f graph is independent of the metal used
        
                (3)  the slope of an E-vs-f graph (i.e., h) is the same as the
                     constant Planck used in his blackbody law
        
1916     Millikan (after three years of experiments) reports that the slope of the 
	    E-vs-f graph is 6.57 x 10-27  erg-sec and independent of the metal used.
        
1917     Millikan declares quantized light theory "untenable".
        
1922     Einstein awarded Nobel Prize "for his services to theoretical physics and 
             especially for his discovery of the law of the photoelectric effect."