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# Photoelectricity question Watch

1. Hey guys.
I have got my Unit1 physics aqa exam and I really want to know how to write a good answer for the photoelectric effect question. I think it'll come up, because it didn't appear in May 2010 paper. However suppose it's a 6 mark question. what do you have to write to get that 6 marks? Please show me a good answer so I can write it in the exam, because I can't link all the points together!!!
Thanks
2. (Original post by alan-93)
Hey guys.
I have got my Unit1 physics aqa exam and I really want to know how to write a good answer for the photoelectric effect question. I think it'll come up, because it didn't appear in May 2010 paper. However suppose it's a 6 mark question. what do you have to write to get that 6 marks? Please show me a good answer so I can write it in the exam, because I can't link all the points together!!!
Thanks
I don't do aqa, wjec nevertheless it still applies.For a six mark question you could start off by first drawing a diagram of the setup i.e labelling the photo cathode,electrode along with micro ammeter and voltmeter.Right down a statement refering to light being "in packets of energy"/quanta and explain what evidence it shows then were left unsolved in the wave theory.
Talk about Einstein's equation: Ekmax = hf-work function.
What work function is, threshold value,stopping voltage.How increasing the intensity of the light increases the overall no. of electron ejections NOT the kinetic energy of each electron.
Definition of photo electric effect: It's the ejection of electrons from a metal surface after light has been shone over it (U.V)
You could also add a para. on how to find the stopping voltage i.e we first shine light over the photo cathode.Electrons starts to eject from there towards the electrode side.As more and more electrons get there,the potential difference at the electrode reaches negative.Also as a result of this repulsion of electrons occurs which decreases your current.Hence a point comes when we actually have no current at all i.e your stopping voltage.
2.00 AM ZZzzz

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