What have you tried so far? Please show what work you've done. We don't give out solutions here.
#3
xlzhsteven
19
0
I don't know what equations to use. Do I have to use the moving speed to find the energy, but I don't know how to use that 300nm since it's not the cutoff wavelength.
#4
borgwal
367
0
The electrons have an "excess" energy: so the work function should equal the difference between the photon energy and the excess energy.
#5
xlzhsteven
19
0
Should I use 0.5mv^2=hc/wavelength-work function, then what should I use for the mass in 0.5mv^2, the mass of an electron?