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Homework Help: What is the threshold wavelength for this surface?

  1. May 18, 2010 #1
    1. The problem statement, all variables and given/known data
    A surface of a substance has a work function of 2.24 eV.
    (a) What is the maximum kinetic energy of ejected electrons if the incident radiation is of wavelength 419 nm?
    eV

    (b) What is the threshold wavelength for this surface?
    nm

    2. Relevant equations
    E=hf


    3. The attempt at a solution
    7.15x10^14
    4.74E^-14
     
  2. jcsd
  3. May 18, 2010 #2

    rock.freak667

    User Avatar
    Homework Helper

    Re: relativity

    Can you please show how you got those answers?
     
  4. May 19, 2010 #3
    Re: relativity

    Thanks for your quick response. I figured out what I was doing wrong and solved it.
     
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