K.E. of Photoelectron
Was Determined By:



a) frequency of light (color)






Rutgers University



| Flash |



The white light was unable to discharge the electroscope  (eject the electrons) but the ultraviolet light could. Why???

The ultraviolet light had a higher frequency ....

... a higher energy.



b) nature of emitting metal

Typical Plot of Frequency of
Light vs. K.E. of Photoelectron

KE of

fo - Threshold Frequency - frequency below which no photoelectrons will be emitted

Below Threshold?



No Emission





 Above Threshold?








Summary of
Photoelectric Effect







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