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During the experiment light was cast upon the photoelectric surface (the metal) and electrons were photo-emitted. The photo-current was measured by an ammeter, and for

During the experiment light was cast upon the photoelectric surface (the metal) and electrons were photo-emitted. The photo-current was measured by an ammeter, and for each frequency of light this photo-current was reduced to zero by adjusting the power supply. Using words, physics formulae and a diagram explain why this step is necessary for the lab.

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1) During the experiment light was cast upon the photoelectric surface (the metal) and electrons were photo-emitted. The photo-current was measured by an ammeter, and for each frequency of light this photo-current was reduced to zero by adjusting the power supply. Using words, physics formulae and a diagram explain why this step is necessary for the lab. E = qustop

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