Having some problem with this question:
The threshold fequency for a material is 5.0*10^14 Hz. Find (a) the work function and (b) the maximum velocity of electrons ejected by radiation of frequency 8.0*10^14 Hz. The mass of an electron is 9.1*10^-31kg.
(a) Can easily be found with W = hf.
My teacher then asked me to calculate the above answer into Electron Volts, which i'm unsure of the answer.
(b) is also giving me some problems. I'm using the equation KE = hf - W, but I don't know where to finish the equation. Below is my attempt.
The Attempt at a Solution
KE(max) = hf - W
= (6.62*10^-34*8*10^14) - (33.1*10^-20)
After this, I get stuck :S I know I need to incorporate the mass of the electron in, but I can't figure it out. If anyone could explain this, it would be great :D