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(Quantum Mechanics)

  1. Nov 15, 2006 #1
    Please Help! (Quantum Mechanics)

    I posted this in the Quantum Physics forum as well, but I ran across this one and thought it may help to put it here too. Sorry for the double post.

    Hi everyone... I am new to this site. I am currently taking a major-related Chemistry course that is concentrating on quantum mechanics right now. I have been working on a homework question for about an hour now, and I am no closer to figuring it out than when I started. Something tells me that it's probably a pretty easy question, if I just knew where to begin. I need to calculate the longest wavelength (minimum frequency, right?) of light in nm that can be used to eject electrons from a surface, given that it takes 254kJ/mole. Can someone please help me!
     
  2. jcsd
  3. Nov 15, 2006 #2
    Light comes in packets. How much energy that packet has depends on the frequency. You need to find the energy it takes to eject a single electron (remember the size of a mole?) and find the frequency of light that has that amount of energy per packet (or quantum).
     
  4. Nov 15, 2006 #3
    Thank you, thank you, thank you, thank you, thank you! You are a life saver! I was trying to make things way too difficult! :biggrin:
     
  5. Dec 10, 2006 #4
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