Question: In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 570nm. (a) What is the work function of

In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 570nm.
(a) What is the work function of this material?
(b) What is the stopping voltages required if light of wavelength 400nm is used?

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