An electron volt is by definition the kinetic energy gained by an electron if it is accelerated through a potential difference of 1V, Consider now an electron accelerated in a potential difference of 5.0 V. The electron thereafter collides with a fictitious atom of the following energy diagram: see fig. 1 a) What is the kinetic energy of the electron before collision? b) At which highest energy level the atom can be excited? Represent this transition on the figure. c) What happens to the excess energy of the electron?

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Energy-F
-DeV
-
-
n-4
-1.7eV
n=3
-2.4 eV
n=2
-3. 2 eV
-6.8eV
Transcribed Image Text:Energy-F -DeV - - n-4 -1.7eV n=3 -2.4 eV n=2 -3. 2 eV -6.8eV
An electron volt is by definition the kinetic energy gained by an electron if it is
accelerated through a potential difference of 1V, Consider now an electron
accelerated in a potential difference of 5.0 V. The electron thereafter collides with a
fictitious atom of the following energy diagram: see fig. 1
a) What is the kinetic energy of the electron before collision?
b) At which highest energy level the atom can be excited? Represent this transition
on the figure.
c) What happens to the excess energy of the electron?
d) Draw on the figure the resulting emission spectra; what are their wavelengths in
nm?
e) Would a photon of 4.7 eV be able to initiate an excitation of this atom? Why if
yes; at which energy level? If no, say why.
Transcribed Image Text:An electron volt is by definition the kinetic energy gained by an electron if it is accelerated through a potential difference of 1V, Consider now an electron accelerated in a potential difference of 5.0 V. The electron thereafter collides with a fictitious atom of the following energy diagram: see fig. 1 a) What is the kinetic energy of the electron before collision? b) At which highest energy level the atom can be excited? Represent this transition on the figure. c) What happens to the excess energy of the electron? d) Draw on the figure the resulting emission spectra; what are their wavelengths in nm? e) Would a photon of 4.7 eV be able to initiate an excitation of this atom? Why if yes; at which energy level? If no, say why.
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