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agreed!! i didn't really struggle during the trials or any other paper this year but that was....sad...:(

hmm...wasn't expecting that...personally, i thought it was much, much harder than all previous papers...argh!!

k≤2 so k can be 2,1,0...etcso sub in k=2, coefficient=80sub k=1, coefficient=-80(but it's a bit wierd...cuz isn't 80>-80?? and don't they want greatest coefficient?)I think the reason why ≥ and not just > is because of pascal's triangle and how the coefficients of the expansion can be...

I see where you're coming from but in the case of the photoelectric effect I don't think that you have an infinite supply of electrons and in the case of you example, cars. The number of electrons ejected is dependent upon how many photons hit the surface of the metal so...technically, in case...

...well, if you define current as the number of electrons passing a certain point...then if the electrons have an increased velocity, the number of electrons passing that 'point' is the same except they're travelling faster...so the photocurrent will still be the same if you increase the...

Alright...so there is an increase in the incident frequency but NOT the intensity right? so the photoelectric effect requires the quantisation of light. So...the intensity is not the strength of the incident light (like in wave theory) but it is how many photons that are hitting the metal...