x Turn on thread page Beta
 You are Here: Home >< Physics

# OCR PHYSICS B G491~ 19th May 2015 AM ~ AS Physics watch

1. If you get a part i) wrong but follow through with the correct method for part ii) do you still get the marks, reckon I'll get 45 or so, hoping A is 40 to get me 80/90 ums!
2. What do people speculate the raw mark grade boundaries will be?
3. (Original post by ss334)
What do people speculate the raw mark grade boundaries will be?
I reckon we should have a poll for this and also difficulty.
4. (Original post by Wolfea)
I reckon we should have a poll for this and also difficulty.
Everyone i have spoken to thought it was hard, some didn't finish
5. (Original post by Zain.chishty)
does anyone know how the graph of the last question about scanning tunnelling microscoper looked like
Sorry about my awful drawing, this is what I got: http://i.imgur.com/cWEsD14.png
6. (Original post by CancerousProblem)
yeah taht was what I put on my paper and I am really confused as to what I should have done. I put down 3.2 with that reasoning but now i have my doubts i think its 4.8
Dw i put 3.2 aswell, not sure why people are saying its 4.8 because you didnt need to use the equation 1/v=1/u +1/f .All it really wanted you to do was find the difference between the 2 curvatures because they were both 1/u if that makes sense and the difference between 0.8 and 4 is 3.2D
7. it was 150, you were calculating the ratio between the resistivities at those specific temperatures, i calculated the resistivityat p3000 and divided it by resistivity at p20 and you get 150
8. (Original post by MOIR1997)
it was 150, you were calculating the ratio between the resistivities at those specific temperatures, i calculated the resistivityat p3000 and divided it by resistivity at p20 and you get 150
Are you sure you didn't just substitute in the same numbers for both? I'm quite sure that the ratio wasn't 150.
9. (Original post by Wolfea)
Are you sure you didn't just substitute in the same numbers for both? I'm quite sure that the ratio wasn't 150.
Im sure
10. (Original post by ss334)
Everyone i have spoken to thought it was hard, some didn't finish
How do i add a poll? I used to be able to. It's not under thread tools
11. (Original post by MOIR1997)
it was 150, you were calculating the ratio between the resistivities at those specific temperatures, i calculated the resistivityat p3000 and divided it by resistivity at p20 and you get 150
I am almost 100% sure the ratio was around 6.something, it was the same when I worked out the resistivities and when I just took the ratio of the resistances. It was 21.something/3.14
12. (Original post by Zain.chishty)
does anyone know how the graph of the last question about scanning tunnelling microscoper looked like
I think something like this if you ignore the fullstops and the little '-' is a small dip

................._______ .............................___ ____ ______
________/............. \______________/.............'-'........... \_________
13. What did anyone get for that question about bytes for the image? Was it something around 75000?
14. (Original post by Wolfea)
Are you sure you didn't just substitute in the same numbers for both? I'm quite sure that the ratio wasn't 150.
it was 6.5 ish.
the formula is RA/l for resistivity, and seeing as the lowest resisitivity (at 20^c) was 3.14 and the highest was 20.05 (depending on which arrangement of P=IV you used), it was the ratio of the two.
15. (Original post by TheMarshan)
I am almost 100% sure the ratio was around 6.something, it was the same when I worked out the resistivities and when I just took the ratio of the resistances. It was 21.something/3.14
are you sure you didnt calculate a length at p3000 and divide that by the length at p20 to get that ratio or something? tbh i cant remember the question entirely
16. (Original post by Sunsteps)
What did anyone get for that question about bytes for the image? Was it something around 75000?
Yeah for first bit and then it was like that number times 90 times whatever the images per second was for second?
17. (Original post by Mutleybm1996)
How do i add a poll? I used to be able to. It's not under thread tools
I dont know member since 5 mins ago ha!
18. (Original post by vish.handa)
I think something like this if you ignore the fullstops and the little '-' is a small dip

................._______ .............................___ ____ ______
________/............. \______________/.............'-'........... \_________

Take note that the small dip probably has to touch the 100pA mark as there was a space between the two atoms.
19. (Original post by Wolfea)
Mine just had three peaks, for the 3 atoms...up to 260pA I believe
I had the same thing, thanks
20. http://www.thestudentroom.co.uk/show....php?t=3341505

poll!
I have no idea what happened to the top two boundaries, it's supposed to be 54-55 and 56-57!

Turn on thread page Beta
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: June 8, 2015
Today on TSR

### Is uni even worth it?

Does anyone use their degree?

Poll
Useful resources

## Make your revision easier

Can you help? Study help unanswered threadsStudy Help rules and posting guidelinesLaTex guide for writing equations on TSR

## Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE