1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: 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...
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook