Chemical Forums
Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: bravoghost on March 19, 2011, 08:36:20 PM
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I found that it takes 11.26 eV to liberate the first electron off a neutral carbon atom. I needed to calculate the wavelength, and my final answer was around 15 nm. I watched someone do the same problem online, and they got roughly 150 nm. Who was right?
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Can you show your process?
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So I did the problem without such liberal rounding, and it came out to about 1.11*10^-7.
11.26 eV = 1.6*10^-19 C
Thus, 11.26 x 1.6*10^-19 = 1.8*10^-18 C (the energy of the ionization)
E=hf
1.8*10^-18 = 6.63*10^-34 x f
f = 2.71*10^15
v=λf
3*10^8 = λ x 2.71*10^15
λ = 1.11*10^-7 m
but that isn't 110 nm, right? If we put that number in nanometers, it'd be .011 nm, right??
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So I did the problem without such liberal rounding, and it came out to about 1.11*10^-7.
11.26 eV = 1.6*10^-19 C
This makes no sense.
Thus, 11.26 x 1.6*10^-19 = 1.8*10^-18 C (the energy of the ionization)
Neither does this.
E=hf
1.8*10^-18 = 6.63*10^-34 x f
f = 2.71*10^15
v=λf
3*10^8 = λ x 2.71*10^15
λ = 1.11*10^-7 m
Nevertheless, this is correct.
1 nanometer is 10-9 meter.