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Questions and Answers
The kinetic energy of an ejected electron is directly proportional to the frequency of the incident light.
The kinetic energy of an ejected electron is directly proportional to the frequency of the incident light.
True
The work function of a material is the maximum amount of energy required to remove an electron from its surface.
The work function of a material is the maximum amount of energy required to remove an electron from its surface.
False
The formula λ_max = hc/φ is used to calculate the kinetic energy of an ejected electron.
The formula λ_max = hc/φ is used to calculate the kinetic energy of an ejected electron.
False
The speed of an ejected electron is directly proportional to its kinetic energy.
The speed of an ejected electron is directly proportional to its kinetic energy.
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Planck's constant is given in units of joules per second (J/s).
Planck's constant is given in units of joules per second (J/s).
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The formula KE = hν - φ is used to calculate the work function of a material.
The formula KE = hν - φ is used to calculate the work function of a material.
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The conversion factor of 1 eV = 1.602 x 10^-19 J is used to convert joules to electron volts.
The conversion factor of 1 eV = 1.602 x 10^-19 J is used to convert joules to electron volts.
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The mass of an electron is approximately 1.00 x 10^-30 kg.
The mass of an electron is approximately 1.00 x 10^-30 kg.
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The speed of an ejected electron can be calculated using the formula KE = hν - φ.
The speed of an ejected electron can be calculated using the formula KE = hν - φ.
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Study Notes
Calculating Kinetic Energy of Ejected Electron
- The kinetic energy (KE) of an ejected electron can be calculated using the formula: KE = hν - φ
- h is Planck's constant, approximately 6.63 x 10^-34 Js
- ν is the frequency of the incident light in Hz
- φ is the work function of the material in J
Maximum Wavelength for Electron Ejection
- The maximum wavelength of light that can cause electron ejection can be calculated using the formula: λ_max = hc/φ
- λ_max is the maximum wavelength for electron ejection
- c is the speed of light, approximately 3.00 x 10^8 m/s
Work Function and its Conversion
- The work function (φ) of a material is the minimum amount of energy required to remove an electron from its surface
- Work function is usually given in electron volts (eV) and can be converted to joules (J) using the conversion factor: 1 eV = 1.602 x 10^-19 J
Calculating Speed of Electrons
- The speed of ejected electrons can be calculated using the kinetic energy formula and the formula: v = sqrt(2KE/m)
- v is the speed of the ejected electron
- m is the mass of the electron, approximately 9.11 x 10^-31 kg
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Description
Learn how to calculate the kinetic energy of an ejected electron and the maximum wavelength of light that can cause electron ejection. Formulas and constants involved are explained.
