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Home Q & A Board Science-Related Homework Help Physics
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illestchemist illestchemist
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11 years ago
I know it depends on the frequency of the photon, but do they know about how much energy a single electron have let's say in blue visible light frequency?
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wrote...
#1
11 years ago
Energy E in electron volts is given by:

  E = 1.24/wl  where wl = wavelength in micrometers

Plug in the value for blue light and you're done.
wrote...
#2
11 years ago
Say you have "blue visible light" at f=631THz

From the equation E=hf, where h is Planck's constant.

Plugging in yields... E=4.18*10^-19J, but if you convert to eV:

E=2.6eV

Not much, really, but is around the same energy that an electron gains when it accelerates through a potential difference of 2 volts.
wrote...
#3
11 years ago Edited: 11 years ago, bio_man
The answer is 3.1 eV. If you considerthat blue light's wavelength is 0.4 micrometers. It means if an electron absorbs this blue light photon then it will get enough kinetic energy to raise its potential by 3.1 volts
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