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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 490 nm .

What is the work function of this material?

Express your answer using two significant figures.
W0 =

  

 eV

What is the stopping voltage required if light of wavelength 420 nm is used?

Express your answer using two significant figures.
V0 =

  

 V
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