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

Reply 200

falconinni

1

Does anyone know if there is going to be an unofficial mark scheme/model answers for this paper soon?

Reply 201

emfp21

How are we supposed to know the units for charge carrier density, why there are 3 squares in a qr code, mass of a raindrop and wood, uses of graphene etc. Taking physics was a huge mistake because half of it isn't physics

Reply 202

Minecraft27

14

Original post by emfp21

How are we supposed to know the units for charge carrier density, why there are 3 squares in a qr code, mass of a raindrop and wood, uses of graphene etc. Taking physics was a huge mistake because half of it isn't physics

I said that the 3 squares were there as a control so the camera could see them and recognise them instantly as a QR code...

Reply 203

DomStaff

2

Original post by rapunzelsa

Wood is 10^3
Infrared is 10^-6
Raindrop is 10^-6

Frequency is s^-1
Charge carrier density is m^-3
Lens power is m^-1

10^-3 Kg for 1 cubic metre of wood? You what? I can't remember the question but I'm sure it was something like that

Reply 204

mhtiger

Original post by Minecraft27

I said that the 3 squares were there as a control so the camera could see them and recognise them instantly as a QR code...

That's what I said, but I googled it and apparently they are position markers?

Reply 205

falconinni

1

Original post by mhtiger

That's what I said, but I googled it and apparently they are position markers?

yes, they show the computer where the information starts and finishes

Reply 206

emfp21

Original post by mhtiger

That's what I said, but I googled it and apparently they are position markers?

Apparently It's so you can capture it from any angle, how are we supposed to know that??!

Reply 207

rapunzelsa

water is 10^3 and wood is only slightly less dense than water.

Reply 208

AlphaMolecule

4

Hehehe I'm gonna be here next year :biggrin:

do you all like the OCR B exam board?

Reply 209

Valyrian

18

That paper was a joke. Thank god I had the German paper right after to bring me back to life!

Reply 210

Valyrian

18

Original post by AlphaNick

Hehehe I'm gonna be here next year :biggrin:

do you all like the OCR B exam board?

L o l, worst exam board e v e r

Reply 211

Wesbian

1

I'm sure resistance for the ldr was 1380 ohms

Reply 212

ThomasNugent

Original post by AlphaNick

Hehehe I'm gonna be here next year :biggrin:

do you all like the OCR B exam board?

Terrible exam board... It's not even just this particular exam, in general this course is pretty bad :frown:

Reply 213

DomStaff

2

Original post by Wesbian

I'm sure resistance for the ldr was 1380 ohms

No, I'm pretty sure it was 463 ohms.

At 1000lux, the p.d. across R was 3.8V.

Therefore 3.8/6 = 800/(800+R of LDR).

With some modest rearranging it yields R of LDR = 463. Check it yourself, 800/1263 * 6 is 3.8000475, so 3.8V.

Reply 214

samsamjr

Original post by Wesbian

I'm sure resistance for the ldr was 1380 ohms

That's what I got but I think we've mixed up the r and ldr voltage, just hope we haven't, but yh that paper was bull****, Ocr aren't good they ****ed our year over in the further maths aswell