Lithium Stopping Voltage Challenge  

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A lithium surface* is irradiated with light of wavelength 476nm. The loss of electrons due to the photoelectric effect causes the metal to acquire a positive potential (V). 

What will this potential be for electrons to be prevented from leaving the surface?

*the work function of lithium (Φ) is 37000 fJ 

PlanckTime - Amin

 
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