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Two light sources are used in a photoelectric experiment to determine the work function for a...

Two light sources are used in a photoelectric experiment to determine the work function for a particular metal surface. When green light from a mercury lamp (λ = 546.1 nm) is used, a stopping potential of 0.954 V reduces the photocurrent to zero.

(a) Based on this measurement, what is the work function for this metal?
eV

(b) What stopping potential would be observed when using light from a red lamp (λ = 628.0 nm)?
V

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