What is the kinetic energy of ejected electrons from a silver surface with a work function of E_A = 4.73 eV if the silver is illuminated with light at a wavelength of ë = 144.2 nm? [h = 6.63 × 10^-34 J s, c = 3 × 10⁸ m/s, 1 eV = 1.6 × 10^-19 J]

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Quizplus · Accepted Answer

The kinetic energy of the ejected electrons can be calculated using the photoelectric equation: KE = hf - Φ, where KE is the kinetic energy, h is Planck's constant, f is the frequency of the incident light, and Φ is the work function. First, convert the wavelength to frequency using the equation f = c/λ, where c is the speed of light and λ is the wavelength. Then, convert the work function and the energy of the photons from eV to Joules to perform the calculation, and finally, convert the result back to eV. The calculation shows that the kinetic energy of the ejected electrons is approximately 3.89 eV.

What Is the Kinetic Energy of Ejected Electrons from a Silver