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The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 490nm is...

  1. The stopping potential for photoelectrons emitted from a surface illuminated by light of wavelength 490nm is 0.70V. When the incident wavelength is changed to a new value, the stopping potential is found to be 1.40V. What is the work function for the surface? What is this new wavelength?
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