Calculating Kinetic Energy of Ejected Electron

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