physics question 3 hw 20

Physics
Tutor: None Selected Time limit: 1 Day

In the photoelectric effect, it is found that incident photons with 4.70 eV of energy will produce electrons with a maximum kinetic energy of 3.90 eV. What is the threshold frequency of this material? Planck’s constant is 6.62607 × 10−34 J · s. Answer in units of Hz.

Jul 14th, 2015

Thank you for the opportunity to help you with your question!

photon energy = work function energy + KE of ejected electron
4.6 = (h * f) + 4.0
to be consistent in units
h = 4.135 667 33E-15eV-s

f = (4.6 - 4.0) / 4.135 667 33E-15 = 1.45E+14 Hz

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jul 14th, 2015

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