Solution: In a photocell, ultraviolet (UV) light provides
Chapter , Problem 75(choose chapter or problem)
In a photocell, ultraviolet (UV) light provides enoughenergy to some electrons in barium metal to eject themfrom the surface at high speed. See Fig. 23-36. To measurethe maximum energy of the electrons, another plate abovethe barium surface is kept at a negative enough potentialthat the emitted electrons are slowed down and stopped,and return to the barium surface. If the plate voltage is-3.02 V (compared to the barium) when the fastest electronsare stopped, whatwas the speed of theseelectrons when they wereemitted?
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