ch38-p016 - hc = 1240 eVnm). Consequently, barium and...

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16. The energy of the most energetic photon in the visible light range (with wavelength of about 400 nm) is about E = (1240 eV·nm/400 nm) = 3.1 eV (using the vlue
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Unformatted text preview: hc = 1240 eVnm). Consequently, barium and lithium can be used, since their work functions are both lower than 3.1 eV....
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