# Reading a Electron Energy v Ligth Frequency Graph

1. Aug 9, 2011

### MRFISCHERRULZ

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. Aug 9, 2011

### Pi-Bond

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)