Experimental results 1)Ekmax is independent of the intensity of light 2)Ekmax changes over the frequency of light 3)If f<fo(cutoff frequency ), no photoelectrons High intensit Low intensity keep f!Experimental results 10 1) Ekmax is independent of the intensity of light 2) Ekmax changes over the frequency of light 3) If f < f0 (cutoff frequency), no photoelectrons