I believe I used the wavelength to find the frequency (assuming v = 3 x 10^8) I then used E=hf to find the total energy and divided this value by the energy of one electron (1.602 x 10^-19J) I cant completely remember but I think this is what I did
I agree that it was C. It was the only logical answer. The max displacement is always going to be when the velocity is 0.
How many marks do you think I'll lose if i forgot the negative sign in the momentum question (how many marks was that question?) Also how many marks was the mean drift velocity question, do u think?
I believe I used the wavelength to find the frequency (assuming v = 3 x 10^8) I then used E=hf to find the total energy and divided this value by the energy of one electron (1.602 x 10^-19J) I cant completely remember but I think this is what I did
Don't u just divide the power by the energy per photon since power is energy per second.
It was 3 marks wasn't it? They generally only give one or two marks if a question has so few steps (I could be incorrect though)
I think you will get the marks for what you got as energy per photon but since photons and electrons have a one to one interaction you couldn't divide it by elementary charge. Probs 2/3