Qualification > Sciences
Edexcel PHYSICS Doubts
The Golden Girl =D:
--- Quote from: MujtabaM on June 04, 2011, 04:40:37 pm ---Somebody pls help me out with this question.....im totally confused :-\:
Why does the Kinetic E of emitted electrons in the photoelectric effect depend only on the frequency and not on the intensity of the light????
--- End quote ---
It is due to the equation E = hf ...
h is Planck's constant ,and since it's constant this means there is a relation between Energy and frequency .
And from this equation we got to know that the Energy of a Photon depends on frequency
I don't think we should know WHY exactly it is this way ...I'm not sure if you we need to know it or not , but I hope you got my point :)
Banana:
Thank you very much Ang3l and GG....the fog in my head is clearin' :)
The Golden Girl =D:
You're welcome :)
Romeesa-Chan:
Physics 6B, Sample Paper:
*Q1bii- where did 8 come from ? :S
*Q2ciii- No idea what the marking scheme says!
*Q3 a & b
*Q4 a & dii
Link: http://www.edexcel.com/migrationdocuments/GCE%20New%20GCE/Physics-Practical-Alternative-SAMs.pdf
Please help me. Have exam the next day (Monday)!!!
elemis:
Q1
% Uncertainty = uncertainty of instrument / actual measurement.
Each foil is 15 micrometres thick. When you decide to measure the thickness of the foil will you measure the thickness of only one foil or several ?
You would do it for several so as to gain an average and eliminate random uncertainties.
If I were you I would measure the thickness of 8 sheets or more. That's where the eight comes from.
Q2
In a roundabout fashion they are asking you to calculate the percentage uncertainty whilst showing workings.
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