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Physics G491 Jan 13, Advancing physics/physics B exam thread

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Reply 60

walkers38

Original post by edexcel

Damn I think diamond is crystalline :frown:

Do you get deducted for every wrong point you make or is it ignored? Also, If you state physics that is correct but not in the right questions along with physics that is correct for the question in long explanation questions, do you still get marks? If you get me? I think I lost 15-20 marks :shot:

You never get 'deducted'. It'll probably be ignored. But if you've given other reasons using 'being crystalline' as a reason those will be ignored too even if they're technically right.

Reply 61

Barney13

Original post by walkers38

Am I the only 'girl' here? Now I understand why this test was hard for me. They should give extra 2 marks to any girls sitting this crazy paper. Haha. #

I kid ^_^

I'm a girl!

Posted from TSR Mobile

Reply 62

edexcel

for the definition of a semiconductor I said that it is a material that exhibits properties of a metal and a nonmetal :s-smilie:

I also said polycrystalline Is a material with both amorphous and crystalline regions :s-smilie:

And I said that the conductivity of a semi conductor can be modified by "doping" by adding different atoms of elements to it :s-smilie:

Reply 63

Choppie

Original post by walkers38

Past years to get an A:
Jan 10: 40
Jun 10: 40
Jan 11: 38
Jun 11: 46
Jan 12: 45
Jun 12: 45

I think grade boundaries for today's would be ~42.

The big list of grade boundaries from Jan 2009 (RAW marks (out of 60)).

January 2009:

Spoiler

June 09:

Spoiler

Jan 2010:

Spoiler

June 10:

Spoiler

Jan 2011:

Spoiler

June 2011:

Spoiler

Jan 2012:

Spoiler

Jun 2012:

Spoiler

(edited 11 years ago)

Reply 64

edexcel

Original post by choppie

the big list of grade boundaries from jan 2009 (raw marks (out of 60)).

january 2009:

Spoiler

june 09:

Spoiler

jan 2010:

Spoiler

june 10:

Spoiler

jan 2011:

Spoiler

june 2011:

Spoiler

jan 2012:

Spoiler

jun 2012:

Spoiler

34?! Whatttttttttttttttttttttt

Reply 65

ChrissM

Original post by edexcel

I put 8. You divide the total voltage (1.2) by the resolution (5mv) and that gets you how many alternative you need and then you take the Log to the base 2 to find the number of bits. Thats what I did and I got 7.97 and rounded it to 8.

What did you get for the oscillations per pulse and the frequency one before it?

I also got 7.97, and rounded it to 8. Was that question 3 marks?

Reply 66

walkers38

Original post by Barney13

I'm a girl!

Posted from TSR Mobile

Your little sign is for a male one though:/ Lol.

Reply 67

Choppie

Original post by edexcel

34?! Whatttttttttttttttttttttt

Grade boundaries can fluctuate hugely depending on how difficult the paper was.

Reply 68

walkers38

Original post by Choppie

The big list of grade boundaries from Jan 2009 (RAW marks (out of 60)).

January 2009:

Spoiler

June 09:

Spoiler

Jan 2010:

Spoiler

June 10:

Spoiler

Jan 2011:

Spoiler

June 2011:

Spoiler

Jan 2012:

Spoiler

Jun 2012:

Spoiler

Jan 10 is 40 for A, not 34!

Reply 69

Choppie

Original post by walkers38

Jan 10 is 40 for A, not 34!

Where are you getting your grade boundaries from? O.o

Reply 70

edexcel

Original post by walkers38

Jan 10 is 40 for A, not 34!

**** that **** :frown:

These are my first ALevel exams and I have released you actually have to think in the exams rather than boke out information onto the page that you have sat and wrote learnt for hours the night before lol

Reply 71

Choppie

Original post by walkers38

Jan 10 is 40 for A, not 34!

Wrong! Look in the attachment of this message.

grade_boundaries_for_as_physics_units.pdf200.1KB

AS Physics Grade Boundaries.PNG89.6KB

Reply 72

Barney13

Original post by walkers38

Your little sign is for a male one though:/ Lol.

Oops, what little sign?

Posted from TSR Mobile

Reply 73

walkers38

Original post by Choppie

Wrong! Look in the attachment of this message.

Why are we typing in large fonts? Lol. Oh and my bad, it was indeed 34. I think I clicked on June 10 twice :unimpressed:

(edited 11 years ago)

Reply 74

walkers38

Original post by Barney13

Oops, what little sign?

Posted from TSR Mobile

Next to your name. The blue arrow thing. When you hover over it, it says you're a male. LOL

Reply 75

Choppie

Original post by walkers38

Why are we typing in large fonts? Lol. Oh and my bad, it was indeed 34. I think I clicked on June 10 twice.

So people weren't misled, and could find the grade boundaries set out by OCR.

Reply 76

Barney13

Original post by walkers38

Next to your name. The blue arrow thing. When you hover over it, it says you're a male. LOL

Oh, i'm on my phone and can't see what you're describing! But i assure you i am a girl:-)

Posted from TSR Mobile

Reply 77

BobGreggary

Original post by ChrissM

I also got 7.97, and rounded it to 8. Was that question 3 marks?

It was 3 marks I believe. I got 7.97; however, surely you should round down?

b \leq \log_2 (\frac{v_total}{v_noise})

b \leq 7.97...

b = 7

I thought you were always supposed to round down as (in terms of a signal) you could capture unwanted noise if you digitise with too many bits per sample

I personally put 7 as my final answer (with 7.97 in my workings), but I'm sure I've seen in a past paper this done somewhere.

Only 1 mark lost I suppose (or at least I hope), but it could be the difference between an A and a B :-(