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Frequency of light to eject electrons from gold

  1. Jul 29, 2008 #1
    What frequency of light must be used to eject electrons from a gold surface with a maximum kinetic energy of 6.48×10(−19)J ?

    The work function of gold is 4.58 eV.

    f=
     
  2. jcsd
  3. Jul 29, 2008 #2

    mgb_phys

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    Re: Frequency

    You have to at least attempt an answer to a homework question.
    Whats the energy of a photon, in terms of frequency?
     
  4. Jul 29, 2008 #3
    Re: Frequency

    I used the formula for K(max) and solved for f and got 6.91 x 10(33)...and that not the right answer
     
  5. Jul 29, 2008 #4

    mgb_phys

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    Re: Frequency

    So you need to supply enough energy to overcomethe work function and then supply the KE.
    So convert the work function into joules and add to the ke.
    Then you just need the energy of aphoton in terms of frequency.

    oops - you didn't post in the HW forum, so didn't get the list of things to do.
     
  6. Jul 29, 2008 #5
    Re: Frequency

    Nevermind...I figured it out
     
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