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: Reading a Electron Energy v Ligth Frequency Graph

  1. Aug 9, 2011 #1
    1. The problem statement, all variables and given/known data

    8. Below is a graph of electron energy v light frequency for platinum. Record and identify the following on the graph.

    • The threshold frequency.

    • The range of frequencies that give an electron a kinetic energy greater than zero.

    • The range of frequencies that do not eject an electron.


    Graph is here : http://imageshack.us/photo/my-images/839/physicsl.png/



    2. Relevant equations



    3. The attempt at a solution

    i have said the the threashold frequency is 1.50x 10^15 Hz

    with the range i have said that 1.50 > 3.00

    and the range that does not eject is between 0 > 1.5


    You guidence is truly appreaciated


    Thanks

    Fischer
     
  2. jcsd
  3. Aug 9, 2011 #2
    You've got them all right, but for the second one you can say that frequencies above 1.50 x 1015 Hz will give an electron with K.E. above zero as opposed to frequencies between 1.50 x 1015 Hz and 3.00 x 1015 Hz (any frequency above the threshold always causes emission)
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook