The energy required to dislodge electrons from sodium metal via the photoelectric effect is 275 kJ/mol. What wavelength in nm of light has sufficient energy per photon to dislodge an electron from the surface of sodium?
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ANSWERS: 2
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Using this joules-to-electron-volts (J to eV) calculator: http://www.unitconversion.org/energy/joules-to-electron-volts-conversion.html 275 kilo-joules = 1.71641425 e+24 eV Divide by Avogadro's number 6.02 e+23, giving 2.86 eV Using another calculator for photon energy: http://pvcdrom.pveducation.org/SUNLIGHT/PENERGY.HTM it's between 433 & 434 nanometers -- "indigo"
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(3e+8)*(6.02e+23)*(6.63e-34)/(275e+3) = 434 nm
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