1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Threshold frequency

  1. Jun 21, 2004 #1
    Dear all

    The question is :
    A certain material has a work function of 0.4eV. What is the energy of a single photon of electromagnetic radiation at the threshold frequency for liberation of photoelectrons?

    Would u give me some hint how to find the threshold frequency at first ??

    thanks all

  2. jcsd
  3. Jun 21, 2004 #2
    Hint : Photoelectric Eqn
  4. Jun 22, 2004 #3
    can i assume the equation is:
    K.E = hf - work function = 0 ??

  5. Jun 22, 2004 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Right. At the threshold frequency the photons have an energy just equal to the work function.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Threshold frequency
  1. Threshold Frequency (Replies: 1)

  2. Threshold Frequency (Replies: 8)