1. 256 nm light strikes a metal and the ejected electrons have a stopping potential of 1.15 V. What is the work function of the metal in eV? (2)
E = hf = hc/, 1 eV = x J
Photon energy = Work function + Kinetic energy of electron
E = hf = hc/ = (6.626 x Js)(3.00 x 108 m/s)/(256 x 10-9 m)
E = x J
E = ( x J)/(1.602 x J/eV) = eV
Photon energy = Work function + Kinetic energy of electron
4.847 eV = Work function eV
eV eV = 3.70 eV W
3.70 eV

2. Light
Wave model Photon model
Color is
Brightness is

3. Max. Energy
of Ejected
Electrons
Wave model Photon model
Depends
on:
Is independent
of:

4. Find the equation of this line. What does the slope mean
Find the equation of this line. What does the slope mean? What does the y-intercept mean? What kind of data is it?