Only need help with 2b 1. A) The work function of a certain metal is = 4.45 eV.
ID: 1475392 • Letter: O
Question
Only need help with 2b
1.
A) The work function of a certain metal is = 4.45 eV. Determine the minimum frequency of light f0 for which photoelectrons are emitted from the metal. (Planck's constant is: h = 4.1357×10-15 eVs.)
1.08×1015 Hz
B) Determine the corresponding wavelength of light. (Possibly useful constant: hc = 1240 eVnm.)
2.79×102 nm
C) Calculate the kinetic energy of the emitted electrons if the frequency of the photons is doubled to 2f0.
4.45 eV
2.
A) What is the maximum wavelength of incident light that can produce photoelectrons from silver? The work function for silver is =2.93 eV. 4.23×102 nm
b) what is the minimal potential needed to fully stop the electrons if the wavelength of the incident light is 313 nm?
Explanation / Answer
KE = E - Wo
KE = dV*e
dV*e = hc/L - Wo
dV*1.6*10^-19 = (6.626*10^-34*3*10^8)/(313*10^-9) - (2.93*1.6*10^-19)
V = 1.04 V
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