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Find the threshold frequency for a calcium

  1. Dec 25, 2006 #1
    1. The problem statement, all variables and given/known data

    This is a pretty simple problem... Yet I got the wrong answer.. Hmm...

    "Find the threshold frequency for a calcium surface whose work function is 3.33eV"

    W=3.33eV = 3.33eV * 1.6x10^-19 J = 5.33x10^19 J
    f = ?
    h=6.63x10^-34 J*S

    2. Relevant equations


    3. The attempt at a solution

    f=(3.33eV)(1.6x10^-19 J) / (6.63x10^-34 J*S) = 8.04x10^14 Hz <- My answer

    The answer in book is 5.02 x10^14 Hz.

    Can anyone tell me what i'm doing wrong?
  2. jcsd
  3. Dec 27, 2006 #2
    turns out the book was wrong... my answer was right. yah...
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