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The stopping potential for electrons emitted from a surface illuminated by light of wavelength 500 nm...

The stopping potential for electrons emitted from a surface illuminated by light of wavelength 500 nm is 0.770 V. When the incident wavelength is changed to a new value, the stopping potential is 1.40 V. (a) What is this new wavelength? (b) What is the work function for the surface?

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