Physics 9702 Paper 5 (52) 18/05/2018

[MahiTheKilla]

How was the paper guys?
personally I found it quite hard. Couldn't finish it properly on time

 

[Ahmed kooheji]

I did p51 and I could relate to you .. was difficult and lengthy

 

[amina1300]

Same 52 was hard couldn't complete the last two parts in time.

 

[MahiTheKilla]

What answers did you guys manage to get in question no.2?
I got all the uncertainities in the table by dividing value of nR by 10. My gradient was (3.5+-0.4)x10^-3 ohm^-1 s
Percentage uncertainity was 9.1%
Value of K (last answer) was 59000+-5000 ohm.
Value of C was (2.2+-0.2) mF
The error bars were horizontal on the graph too.

 

[Zaki ali asghar]

Q1 was quite easy, I found Q2 bit hard. My value of K was 60000, rest i don't remember

 

[Zaki ali asghar]

wasn't 10 the %uncertainity in the values of R ?

 

[MahiTheKilla]

I did q1 later.. i didnt mention details about how to vary h like replacing LEDs with different lights, etc :| but i wrote down all the safety precautions and additional details. Also about plotting a graph. How much marks do you think I'd lose?

 

[Zaki ali asghar]

2 marks are for independent and dependable variables
3 for graph analysis
6 for add and safety details
4 for diagram and how to collect measures.
i guess you'll lose around 2

 

[MahiTheKilla]

Thankyiou so much! But im scared because the point of q1 is having control over your variables in the experiment and I didnt even mention once on how to collect data for different wavelengths and heights. Injust wrote about what to keep constant and how it could be done.

And yeah 4.7+-10% was the uncertainity for R

 

[bacon byun]

What were the dependent and independent variables in Q1?

 

[Zaki ali asghar]

wavelength, independent and h dependent