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# Edexcel Physics Unit 3 9th May watch

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1. (Original post by muf_mur)
hope these help
These Notes are great! Do you have any for the Paper 8 next week?
Thank you!
2. I always seem to have a problem in finding the most easiest thing the GRADIENT of the graph!My answers do not match with range given in the markscheme.I do use the triangle method to find it but it never matches.Can anyone please help!Please explain using Jan13 Q6d....ASAP!
3. Just did a paper in 30 mins this should be going well tomorrow boosting my confidence for other exams.
4. Help! Can someone help explain Jan 2012, everything from qu8d) and onwards? Completely lost from there.....

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5. (Original post by leafy9)
Help! Can someone help explain Jan 2012, everything from qu8d) and onwards? Completely lost from there.....

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This has to do with the energy of the EMITTED photon (same as the kinetic energy of the emitted photon)((ALSO rmember eV IS simply charge by voltage which is a measurement for energy!!!)) being equal to the energy of the Incident(absorbed) photon minus the work function... So for Question 8d you simply have to state points like

- It is a straight line as it resembles the formula for a straight line i.e y=mx +c where e,h are constants....T

- The slope of the graph of a straight line would be the constant m but in the formula given, the slope will be simply H/e (remeber to ALWAYS make it in the form of Y=mx+c in this case V = (h/e)f + (phi/e)....so to find plancks constant simply multiply by e (elementary charge 1.6 x 10^ -19)

FOr part E just work out what ive said in the second point...not difficult just be careful as usual and show steps..

and for the last step just remember the constant in the equation V = (h/e)f + (phi/e) is the y intercept so just say all you have to do is read off that value and multiply by e...that would be the work function,.
6. (Original post by NilFBosh)
So these are the practicals you have to study.

Unit 1 practicals

1) Calculating speed and acceleration using a) Ticker tape
b) Light Gate

2) Calculating acceleration of free fall.

3) Comparing viscosity of liquids, calculating viscosity, terminal velocity and drag force using stokes' law.

4) Calculating young modulus using a copper wire.

Unit 2

1) Measuring the resistivity of a wire

2) Measuring the internal resistance of a cell

3) Finding the condition to obtain optimum power output in the load (Not sure if this experiment is in the syllabus)

4)Verifying the change in resistance of thermistor with temperature

5) Measuring Plancks constant

6) Standing/Stationary waves experiment (Not sure abt this but better to be sure)

If there's something missing pls let me know

you forgot the experiment to determine the constant of a spring
7. (Original post by sakuuuu5)
you forgot the experiment to determine the constant of a spring
But shouldn't you wait for 12 hrs before discussing the paper or be banned?

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8. Why isnt this thread locked?

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9. Is it allowed to store stuff in your cal during the exams?
I just did that for this paper but now I deleted them all.

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10. (Original post by StUdEnTIGCSE)
Is it allowed to store stuff in your cal during the exams?
I just did that for this paper but now I deleted them all.

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Before the xam we get a speech telling us to not store things in cal. Remember?

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11. (Original post by StUdEnTIGCSE)
But shouldn't you wait for 12 hrs before discussing the paper or be banned?

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Yeah, we have to wait until midnight UK time. Otherwise a 10 point warning. Plus, technically, if Edexcel traces you, you could get disqualified for that exam you took. You did sign a declaration form stating that you wouldn't participate in such discussion, after all.

(Original post by StUdEnTIGCSE)
Is it allowed to store stuff in your cal during the exams?
I just did that for this paper but now I deleted them all.

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I'm pretty sure you're not - though you can get away with it if your teachers don't go around and make sure everyone resets their calculators, which yours obviously didn't.

The rules say no, though, I'm quite sure.
12. Unofficial mark scheme:
1)B 2) D 3)C 4)B 5) C

7)Experiment for Spring constant

8) m = hc/e c = speed of light, e = electron charge

8 part c) Graph ,part d) find plancks constant ,part e)Suggest difference between real constant and your given constant i calculated 5.54x10 -34

btw the way i finished 20mins early
13. Guys I did a small mistake when calculating the gradient.. I used my calculation of gradient by using y-0/0-x but the problem is, the graph didn't start at origin. I realized that mistake one minute before the exam ended and couldn't do a thing but look at my paper being taken away knowing I had that nasty little mistake on it. I got h= 4.1*10^-34. How many marks do you think I'll lose?

For the column heading I got it as Mega m-1. I'm sure of it. You could also write it as *10^-3 nm.

For the advantages and disadvantages: With micrometer there is greater precision. For metre rule the student has to do some calculations whereas you only measure with micrometer - no calculations needed. Both have parallax and zero errors which need to be taken into account. Metre rule method has greater reliability as it helps identify anomalies. Is that enough for 4 marks?
14. heyc guys whr can i get the unit 2 passprs and marking sheme frm 2009 onwrds its not available in the edexcel website
15. (Original post by Gunner121)
From June 2009 till June 2012 you can get the mark scheme and the examiner report on this link :
http://www.edexcel.com/quals/gce/gce...s/default.aspx

For Jan 2013 the mark scheme (first link) and examiner report (second link) :

http://www.mediafire.com/?5djntd8dd7ykb

http://www.studentforums.biz/index.p...;topicseen#new

i think for the second link you will have to create an account to access it.

heyc guys whr can i get the unit 2 passprs and marking sheme frm 2009 onwrds its not available in the edexcel website
Guys I did a small mistake when calculating the gradient.. I used my calculation of gradient by using y-0/0-x but the problem is, the graph didn't start at origin. I realized that mistake one minute before the exam ended and couldn't do a thing but look at my paper being taken away knowing I had that nasty little mistake on it. I got h= 4.1*10^-34. How many marks do you think I'll lose?

For the column heading I got it as Mega m-1. I'm sure of it. You could also write it as *10^-3 nm.

For the advantages and disadvantages: With micrometer there is greater precision. For metre rule the student has to do some calculations whereas you only measure with micrometer - no calculations needed. Both have parallax and zero errors which need to be taken into account. Metre rule method has greater reliability as it helps identify anomalies. Is that enough for 4 marks?
mega m^-1 should have been microm^-1,mustn't it?
Because to get 1/lambda they had first divided by 10^3 converting the nm to micrometer then inversed it.

A unit and its prefix go as one unit, doesn't it? So mega m-1 isnt mega^-1 m^-1.
In chemistry we have done IR spectroscopy. The wavelength of IR was in cm and when to convert to wave number (number of waves per cm) which was also 1/lambda the units were cm^-1.

So in that question 1/lambda meant number of waves in a micrometer length.

The meter rule method had GREATER uncertainty and you should prove why it was so? ?

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17. (Original post by Relaxedexams)
Before the xam we get a speech telling us to not store things in cal. Remember?

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But they didn't check.
So we can't go home and reload all your answers and check with someone else? For m1?
OK then. Should reset it.

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18. (Original post by StUdEnTIGCSE)
mega m^-1 should have been microm^-1,mustn't it?
Because to get 1/lambda they had first divided by 10^3 converting the nm to micrometer then inversed it.

A unit and its prefix go as one unit, doesn't it? So mega m-1 isnt mega^-1 m^-1.
In chemistry we have done IR spectroscopy. The wavelength of IR was in cm and when to convert to wave number (number of waves per cm) which was also 1/lambda the units were cm^-1.

So in that question 1/lambda meant number of waves in a micrometer length.

The meter rule method had GREATER uncertainty and you should prove why it was so? ?

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No, it's Mega m-1.

First it was nanometres. Or in other words, .

Then, it's converted to micrometers, or .

Then they inversed it. So it becomes , or Mega m-1.

I'm guessing you forgot to inverse the .
19. (Original post by Aerosports)
Unofficial mark scheme:
1)B 2) D 3)C 4)B 5) C

7)Experiment for Spring constant

8) m = hc/e c = speed of light, e = electron charge

8 part c) Graph ,part d) find plancks constant ,part e)Suggest difference between real constant and your given constant i calculated 5.54x10 -34

btw the way i finished 20mins early
I can't remember the exact choices for the MCQ.

I remember the unit for resistivity was ohm metre, the measurement that didn't need to be taken was mass of the ball, the frequency question was 250 Hz... I can't really remember the other questions.

I actually only got for the Planck constant... and it was a correct graph, through the origin and everything hopefully that's in the acceptable range of answers
20. (Original post by justinawe)
No, it's Mega m-1.

First it was nanometres. Or in other words, .

Then, it's converted to micrometers, or .

Then they inversed it. So it becomes , or Mega m-1.

I'm guessing you forgot to inverse the .
Prefix are considered part of a unit so microm^-1 is 1/microm, which makes sense.

Its a wave number, we studied this in Chem. I might have got confused

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