Energy in electron volts question?
Just wondering if I worked this question out right as for some reason I don't think my answer looks right.
Question:
Sunlight has an average wavelength of about 550nm. Photons of sunlight absorbed by a photovoltaic cell deliver their energy to electrons. Calculate that energy in electron volts (eV).
My answer:
3.616x10^-19 eV
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Verified answer
Plancks constant has (2) versions;
one in Joule*seconds (J*s) and one in electronVolt*seconds (eV*s):
* 6.626E-34 J*s
* 4.137E-15 eV*s
http://en.wikipedia.org/wiki/Planck_constant
E = (h * c) / λ
E = (4.137E-15 eV*s) * (299,792,458 m/s) / 550E-9 m
E = 2.2550 eV
It looks like you have used E = hc/λ. This gives the photon energy in joules.
Now convert your answer to eV by dividing by 1.6x10^-19 (because 1eV = 1.6x10^-19J).