An electron moves a distance of 20 cm. The start location is at a potential that is 120 V lower than the potential at the ending location. Find the change in the electron’s potential energy in units of eV first and then convert the answer to units of Joules. (d) When is it easier to calculate the energy in eV and then convert to Joules if necessary? When is it easier to calculate the energy in Joules first and then convert to eV if necessary? (e) For E level work: If the electric potential energy of an electron moving to a higher potential is converted to light (a photon is emitted,) then the wavelength of the light is related to the change in the electron’s energy U by the following relationship: λ = (1240 nm · eV )/U, where the energy is measured in eV. Use this relationship find the wavelength (in nm) of the light emitted by the electron crossing a 1.5 V potential difference. In what part of the spectrum
(c) An electron moves a distance of 20 cm. The start location is at a potential that is 120 V lower
than the potential at the ending location. Find the change in the electron’s potential energy in
units of eV first and then convert the answer to units of Joules.
(d) When is it easier to calculate the energy in eV and then convert to Joules if necessary? When
is it easier to calculate the energy in Joules first and then convert to eV if necessary?
(e) For E level work: If the electric potential energy of an electron moving to a higher potential
is converted to light (a photon is emitted,) then the
change in the electron’s energy U by the following relationship:
λ = (1240 nm · eV )/U,
where the energy is measured in eV. Use this relationship find the wavelength (in nm) of the
light emitted by the electron crossing a 1.5 V potential difference. In what part of the spectrum
(radio, IR, visible, - and if so, what color UV, x ray, etc) is that? (you probably need to look it
up! Feel free to search the internet.)
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