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# AQA Physics Unit 1 PHYA1 20th May 2013 Watch

1. (Original post by rainerised)
Does anyone know how to do q6b on jan 13?
V=(v(t)*R)/R(t)

Use potential divider theory on each separate branch

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2. (Original post by StalkeR47)
Lol nice name milkybarkid.... I am in exact same position as you. I am fantastic with quantum and particle physics not but much with electricity. I have just asked on of my friend for the notes on physics electricity. My friend sent me these note and I will like to share these with everyone! http://s1195.photobucket.com/user/po...?sort=2&page=1
These are terrific notes for electricity!
3. (Original post by L'Evil Fish)
Hi, I'm in year eleven, and I'll be with AQA for Physics next year.

Does anyone have any websites with which I can look at and learn content?
Look at doctor a physics on YouTube he has some nice videos. Surely you should be revising for GCSE's rather than worrying about A level physics?

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4. (Original post by Goods)
Look at doctor a physics on YouTube he has some nice videos. Surely you should be revising for GCSE's rather than worrying about A level physics?

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For the summer (while I'm fasting, or not doing anything I'll try)

GCSEs are mind numbing
5. What is the likely topic of the 6 mark question in the middle?
6. Can someone please explain to me, is the only difference between threshold frequency and work function that you times frequence by planks constant to ge the work function? Because Work function = hf, where f is the threshold frequency, so aren't they basically the same thing, dictating the energy required by a electron to be liberated with no kinetic energy?

Also, what are all of the 6 markers that we need? I've figured out:
Photoelectric effect,
Measuring Resistance
Using an oscilloscope
Measuring internal resistance
Determinging resestivity of a wire
Ploting the IV characteristics of a junction diode

Any others that may come up?
7. (Original post by Steroidsman123)
Can someone please explain to me, is the only difference between threshold frequency and work function that you times frequence by planks constant to ge the work function? Because Work function = hf, where f is the threshold frequency, so aren't they basically the same thing, dictating the energy required by a electron to be liberated with no kinetic energy?

Also, what are all of the 6 markers that we need? I've figured out:
Photoelectric effect,
Measuring Resistance
Using an oscilloscope
Measuring internal resistance
Determinging resestivity of a wire
Ploting the IV characteristics of a junction diode

Any others that may come up?
Threshold frequency is the minimum frequency for electrons to overcome work function, as hf must be greater than this work function, otherwise no electrons are emitted from the meyal surface. Work function is simply the minimum energy required to remove an electron from it metal surface, they are both very similar thing really

For the photoelectric effect, we are not meant to know the actual experiment for the photoelectric effect are we?

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8. (Original post by Steroidsman123)
Can someone please explain to me, is the only difference between threshold frequency and work function that you times frequence by planks constant to ge the work function? Because Work function = hf, where f is the threshold frequency, so aren't they basically the same thing, dictating the energy required by a electron to be liberated with no kinetic energy?

Also, what are all of the 6 markers that we need? I've figured out:
Photoelectric effect,
Measuring Resistance
Using an oscilloscope
Measuring internal resistance
Determinging resestivity of a wire
Ploting the IV characteristics of a junction diode

Any others that may come up?
Equation for work function is WF = hf - Ekmax!

But yes you are right, they pretty much dictate the same thing. Since the energy of a photon is dependant on its frequency, it must therefore be at a "threshhold frequency" in order to overcome the work function of the metal surface electrons!
9. (Original post by Jimmy20002012)
Threshold frequency is the minimum frequency for electrons to overcome work function, as hf must be greater than this work function, otherwise no electrons are emitted from the meyal surface. Work function is simply the minimum energy required to remove an electron from it metal surface, they are both very similar thing really

For the photoelectric effect, we are not meant to know the actual experiment for the photoelectric effect are we?

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I think it's good to have a rough idea of the experiment, i.e. you shine a source of EM radiation on the surface of a metal blah blah, but I'm not sure there'll be a 6 marker on this because I don't think it's an experiment you do in class
10. how many sig figs do we go to when not specified
11. (Original post by BenChard)
how many sig figs do we go to when not specified
It doesn't matter unless it says "Give your answers to an appropriate number of significant figures." Just don't go crazy with them, though.
12. (Original post by BenChard)
how many sig figs do we go to when not specified
As far as I know it's however many significant figures that they give you in the information, i.e. if they ask you to work out the voltage of something and they give you current as 15.3A and resistance as 3.3 Ohms, you give your answer to the lowest amount of significant figures in the information given, which is 3.3 Ohms (2sf), so you do your answer to 2 sig figs
13. (Original post by Bixel)
As far as I know it's however many significant figures that they give you in the information, i.e. if they ask you to work out the voltage of something and they give you current as 15.3A and resistance as 3.3 Ohms, you give your answer to the lowest amount of significant figures in the information given, which is 3.3 Ohms (2sf), so you do your answer to 2 sig figs
True, but you only have to do that if it explicitly says "Give your answers to an appropriate number of significant figures" (it's the only question on which you can be penalised for sig figs). But it's good practice to do what you said.
14. (Original post by usycool1)
True, but you only have to do that if it explicitly says "Give your answers to an appropriate number of significant figures" (it's the only question on which you can be penalised for sig figs). But it's good practice to do what you said.
Significant figures are more important in Unit 2 right ?
15. (Original post by posthumus)
Significant figures are more important in Unit 2 right ?
I think they're just as important in each paper.

This is what the markscheme says:

"The use of significant figures is tested once on each paper in a designated question or part-question."

16. (Original post by usycool1)
I think they're just as important in each paper.

This is what the markscheme says:

"The use of significant figures is tested once on each paper in a designated question or part-question."

Oh okay thanks for that ! ... my teacher used to emphasize a lot on significant figures for that unit, I guess it's not as important as he made it out to be
17. (Original post by usycool1)
True, but you only have to do that if it explicitly says "Give your answers to an appropriate number of significant figures" (it's the only question on which you can be penalised for sig figs). But it's good practice to do what you said.
Yeah, exactly
18. Could someone just quickly go over line emission spectrum and line absorption?
19. In the specification it says that we should know how to calculate he specific charge of an ion, how do we do this, say we had lot 2 electrons from an atom forming a +2 ion?

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20. (Original post by NLoR)
Could someone just quickly go over line emission spectrum and line absorption?
They're made when the electron goes from it's excited state back down to a lower energy level, emitting photons in the process. These photons have a specific wavelength depending on the difference in energy levels it goes between - that specific wavelength will be a specific colour on the line spectrum. When all of these different electrons fall back down to lower energy levels, a line spectrum is produced!

Sorry that the explanation was rough but that's the general idea!

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