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ANSWERS: OCR Physics B(Advancing Physics) G491~ 20th May 2014~ AS Physics

Mutleybm1996

OP

As we're the first year to not have January exams (ie: I would have taken G491 if we had January exams), will the grade boundaries change to reflect the extra 5 months of preparation?

I'm hoping an A is ~45.

Either higher due to prep or lower due to so many exams

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Reply 41

kobobo

1

Original post by Mutleybm1996

Either higher due to prep or lower due to so many exams

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What do you think a B would be? I'm definitely not going to get an A in physics, hopefully i can try to get a B even though I'm dropping Physics. Really scared for this exam; i've got 5 exams this upcoming week! :frown:

Reply 42

Robbo54

2

Original post by kobobo

What do you think a B would be? I'm definitely not going to get an A in physics, hopefully i can try to get a B even though I'm dropping Physics. Really scared for this exam; i've got 5 exams this upcoming week! :frown:

Well, 42/60 was the boundary for June 2013. That's what's it is normally at (70%).

Who knows if OCR will lower/higher the grade boundaries. They always want the same number of people getting the same grades, each year.

Me, too. I can never get full marks on the microstructure questions (eg: 8c on January 2010.) It's safe to say I'm most worried for this out of ALL my exams.

Reply 43

urz13

8

Can anyone explain this to me? It's question 11. (a) (ii) on the June 2010 paper.
The question is: A sample is digitised....using a 16bit sampling rate. The maximum peak to peak signal voltage is 100mV. Show that the voltage resolution is less than 2uV.
There is also a graph of p.d./mV over time.

The mark scheme says:
Resolution = (100x10^-3V/(2^16)-1)

I don't understand where the minus 1 is coming from and I've never seen this equation before! Can anyone help?

Reply 44

Mutleybm1996

OP

19

Do we need to know about ultrasound?

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Reply 45

Mutleybm1996

OP

19

Original post by kobobo

What do you think a B would be? I'm definitely not going to get an A in physics, hopefully i can try to get a B even though I'm dropping Physics. Really scared for this exam; i've got 5 exams this upcoming week! :frown:

^?

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Reply 46

Mutleybm1996

OP

19

ImageUploadedByStudent Room1400508728.380907.jpg

Do we have to know how to do this?

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Reply 47

Robbo54

2

Original post by urz13

Can anyone explain this to me? It's question 11. (a) (ii) on the June 2010 paper.
The question is: A sample is digitised....using a 16bit sampling rate. The maximum peak to peak signal voltage is 100mV. Show that the voltage resolution is less than 2uV.
There is also a graph of p.d./mV over time.

The mark scheme says:
Resolution = (100x10^-3V/(2^16)-1)

I don't understand where the minus 1 is coming from and I've never seen this equation before! Can anyone help?

No of alternatives = 2^16.

Max number is 2^16 -1 (as you don't count 0.)

For example, the max number you can count to with an 8 bit number is 255.

(edited 9 years ago)

Reply 48

Mutleybm1996

OP

19

Original post by Robbo54

No of alternatives = 2^16.

Max number is 2^16 -1 (as you don't count 0.)

For example, the max number you can count to with an 8 bit number of 255.

Does this stem from log2(Vt/Vn) ?

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Reply 49

Cluck

10

Original post by Mutleybm1996

Do we have to know how to do this?

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I think we need to understand the method, but it's very unlikely that they'll expectus to memorise the average number of lines on a page or something, since it came up recently.

Reply 50

Robbo54

2

Original post by Mutleybm1996

Does this stem from log2(Vt/Vn) ?

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I don't think so.

Essentially it's the smallest change the equipment is capable of measuring.

R = 0.01 (assuimg the equipment can measure to 2dp) / Sensitivity.

Here's the wikibooks article

Reply 51

9876cd

What structure do ceramics have?

Reply 52

Valyrian

18

This exam board is a piece of poop, the text books is like reading some flipping foreign text lol

Reply 53

Valyrian

18

Original post by 9876cd

What structure do ceramics have?

Aren't ceramics amorphous - so they have really random(non directional bonds) structure patterns with more than one different sized atom thingys, in a lattice??

Reply 54

Robbo54

2

Original post by 9876cd

What structure do ceramics have?

1.) Strong covalent/ionic bonds (directional) -> Strong
2.) Rigid lattice -> stiff
3.) No glide (as rigid structure and amorphous) -> Brittle.

(edited 9 years ago)

Reply 55

Mutleybm1996

OP

19

Do we need to know about ultrasound?

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Reply 56

Andromeda2.5

How much percentage is each of the different sections of the total AS grade? All I know is coursework is 20%

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Reply 57

Wesbian

1

I kinda need help on materials, the stuff on plastic flow and crack propagation

Reply 58

username1136031

1

Original post by Andromeda2.5

How much percentage is each of the different sections of the total AS grade? All I know is coursework is 20%

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The specification says that 491 is 30% (60 marks) and 492 is 50% (100 marks), which doesn't make a whole lotta sense as 30+60+100=190, and when was 100 ever half of 190?

Reply 59

Ella_C

Is says on the spec we need to know about evidence of size of particles and spacing, is this about the experiment with oil and water?

ANSWERS: OCR Physics B(Advancing Physics) G491~ 20th May 2014~ AS Physics

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