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marquisha marquisha
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9 years ago
What is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 2.20 eV?
 
257 nm
417 nm
344 nm
564 nm
610 nm
 
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Valued Member
9 years ago
https://biology-forums.com/index.php?topic=12294.0

This should help, please use the search first before asking questions.
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YogenYogen
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Posts: 199
1 months ago
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The lowest energy of light that can overcome the work function is 1.9 eV. The energy of a photon of wavelength L is given by 1240 (nm)* eV / L (nm)

L = 1240/2.2 = 563.6363 nm
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