The photoelectric work function (Ewr) of a metal is the minimum energy need to eject an electron from the surface of a metal by irradiating it with photons of light. If the energy of the photon (Ephoton) is greater than the photoelectric work function (EwF), the excess energy is absorbed by the electron 'and becomes the kinetic energy (KE ) of the electron. (KEe = Ephoton - EwF) To measure the photoelectric work function (Ewr) of an unknown metal, and to determine its identity, it is irradiated with three different wavelengths of light: • Irradiation with light with a wavelength of 240.9 nm did not eject any electrons from the surface of the metal. Irradiation with light with a wavelength of 185.4 nm cause electrons to be ejected from the surface of the metal with a velocity of 3.49 x 10° m/s. Calculate the energy of the photon (Ephoton) with a wavelength (A Jof 185.4 nm: [ Select) x 10 19 J/photon Calculate the Kinetic Energy (KE.) of the ejected electron: [ Select) x 10 19 J/electron Calculate the photoelectric work function (Ewr) of the metal: [ Select] v x 10 19 J Identify the metal: [ Select ) Metal: Photoelectric Work Function Uranium 5.767 x 1019 J Cadmium 6.521 x 1019 J Niobium 6.889 x 10 19 J Cobalt 8.011 x 1019 J Platinum 10.174 x 1019 J Calculate the velocity of the electrons (Ve) that would be ejected from this metal surface when it is irradiated with photons with wavelengths of 91.3 nm. velocity (Ve) = [Select] x 10° m/s
The photoelectric work function (Ewr) of a metal is the minimum energy need to eject an electron from the surface of a metal by irradiating it with photons of light. If the energy of the photon (Ephoton) is greater than the photoelectric work function (EwF), the excess energy is absorbed by the electron 'and becomes the kinetic energy (KE ) of the electron. (KEe = Ephoton - EwF) To measure the photoelectric work function (Ewr) of an unknown metal, and to determine its identity, it is irradiated with three different wavelengths of light: • Irradiation with light with a wavelength of 240.9 nm did not eject any electrons from the surface of the metal. Irradiation with light with a wavelength of 185.4 nm cause electrons to be ejected from the surface of the metal with a velocity of 3.49 x 10° m/s. Calculate the energy of the photon (Ephoton) with a wavelength (A Jof 185.4 nm: [ Select) x 10 19 J/photon Calculate the Kinetic Energy (KE.) of the ejected electron: [ Select) x 10 19 J/electron Calculate the photoelectric work function (Ewr) of the metal: [ Select] v x 10 19 J Identify the metal: [ Select ) Metal: Photoelectric Work Function Uranium 5.767 x 1019 J Cadmium 6.521 x 1019 J Niobium 6.889 x 10 19 J Cobalt 8.011 x 1019 J Platinum 10.174 x 1019 J Calculate the velocity of the electrons (Ve) that would be ejected from this metal surface when it is irradiated with photons with wavelengths of 91.3 nm. velocity (Ve) = [Select] x 10° m/s
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter5: Electron Configurations And The Periodic Table
Section: Chapter Questions
Problem 133QRT
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![The photoelectric work function (Ewr) of a metal is the minimum energy need to eject an electron from the surface of a metal by irradiating it with photons of light.
If the energy of the photon (E,hoton) is greater than the photoelectric work function (Ewr), the excess energy is absorbed by the electron and becomes the kinetic energy (KE. )
of the electron.
(KE. = Ephoton - EwF)
To measure the photoelectric work function (Ewr) of an unknown metal, and to determine its identity, it is irradiated with three different wavelengths of light:
- Irradiation with light with a wavelength of 240.9 nm did not eject any electrons from the surface of the metal.
- Irradiation with light with a wavelength of 185.4 nm cause electrons to be ejected from the surface of the metal with a velocity of 3.49 x 10 m/s.
Calculate the energy of the photon (Ephoton) with a wavelength (A Jof 185.4 nm:
(Select]
x 10 19 J/photon
Calculate the Kinetic Energy (KE.) of the ejected electron:
(Select ]
x 10 19 J/electron
Calculate the photoelectric work function (EwF) of the metal:
[ Select)
v x 10 19 J
Identify the metal:
(Select]
Metal:
Photoelectric Work Function
Uranium
5.767 x 1019 J
Cadmium
6.521 x 10 19 J
Niobium
6.889 x 10-19 J
Cobalt
8.011 x 10 19 J
Platinum
10.174 x 10 19 J
Calculate the velocity of the electrons (Ve) that would be ejected from this metal surface when it is irradiated with photons with wavelengths of 91.3 nm.
v x 10° m/s
velocity (Ve) = [Select]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F66173c1a-f883-4b2a-9c4a-34112153fb2f%2F4e91aa83-2b2e-44ab-bfd1-c39f5ae32e9f%2Fz51bzcb_processed.jpeg&w=3840&q=75)
Transcribed Image Text:The photoelectric work function (Ewr) of a metal is the minimum energy need to eject an electron from the surface of a metal by irradiating it with photons of light.
If the energy of the photon (E,hoton) is greater than the photoelectric work function (Ewr), the excess energy is absorbed by the electron and becomes the kinetic energy (KE. )
of the electron.
(KE. = Ephoton - EwF)
To measure the photoelectric work function (Ewr) of an unknown metal, and to determine its identity, it is irradiated with three different wavelengths of light:
- Irradiation with light with a wavelength of 240.9 nm did not eject any electrons from the surface of the metal.
- Irradiation with light with a wavelength of 185.4 nm cause electrons to be ejected from the surface of the metal with a velocity of 3.49 x 10 m/s.
Calculate the energy of the photon (Ephoton) with a wavelength (A Jof 185.4 nm:
(Select]
x 10 19 J/photon
Calculate the Kinetic Energy (KE.) of the ejected electron:
(Select ]
x 10 19 J/electron
Calculate the photoelectric work function (EwF) of the metal:
[ Select)
v x 10 19 J
Identify the metal:
(Select]
Metal:
Photoelectric Work Function
Uranium
5.767 x 1019 J
Cadmium
6.521 x 10 19 J
Niobium
6.889 x 10-19 J
Cobalt
8.011 x 10 19 J
Platinum
10.174 x 10 19 J
Calculate the velocity of the electrons (Ve) that would be ejected from this metal surface when it is irradiated with photons with wavelengths of 91.3 nm.
v x 10° m/s
velocity (Ve) = [Select]
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