The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength λ1 = 491nm is V1. When the incident wavelength is changed to a new value λ2 = 382nm, the stopping potential is doubled. a) What is the numerical value of V1? b) What is the work function for the surface?

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Chapter6: Photons And Matter Waves
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 The stopping potential for photoelectrons emitted from a surface illuminated by
 light of wavelength λ1 = 491nm is V1. When the incident wavelength is changed to a
 new value λ2 = 382nm, the stopping potential is doubled.
 a) What is the numerical value of V1? 
 b) What is the work function for the surface?

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