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In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less...

In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 430 nm .

Part A

What is the work function of this material?

Express your answer using two significant figures. W0 =    eV

Part B

What is the stopping voltage required if light of wavelength 380 nm is used?

Express your answer using two significant figures. V?0 =    V

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