Question: In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 550 nm. (a) What is the work function

In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 550 nm.
(a) What is the work function of this material?
(b) What stopping voltage is required if light of wavelength 400 nm is used?

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