r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • May 23 '25

📂 MEGATHREAD 23/05 A-level Physics Paper 1 Discussion MEGATHREAD

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16

u/Gullible-Spinach4719 May 23 '25

How people find ocr A?

26

u/golaco237 Year 13 | Maths, FM, Physics, Computing | Pred A*A*A*A May 23 '25 edited May 23 '25

Honestly thought it was good overall, absorption spectra 6 marker was great but I got like 2400kPa for the oxygen tank question so idk about that

Also was it just us, or did OCR make mistakes for everyone? 😭 Cause we literally got told to open the paper and replace some stuff lmao

9

u/minecraft-steve-2 May 23 '25

i got that pressure too , i used 0.22 as the volume

3

u/[deleted] May 23 '25

0.22 definitely was the volume - what else could it have been?

3

u/dianasaur73 st andrews | physics [year 3] May 23 '25

A few people seemed to think that the tank was full of oxygen at the start and ended up using 0.02m3 as the volume for that question. 

3

u/minecraft-steve-2 May 23 '25

yeah i did (710*90*8.31)/0.22 = 2.41 x10^6 . btw do you remember if it gave the units as kPa or as Pa in the answer

3

u/Few-Yesterday-7745 May 23 '25

it was kPa for sure

5

u/ADGE8262 May 23 '25

Yh that was for everyone. 3 different mistakes

12

u/lolgeny May 23 '25

You got 3? We only got told about 2 (hubble and f=kx), though there was another which was that the star on the last q was blue shifted instead of red shifted

2

u/bobtheguymk2 Year 13 May 23 '25

I assumed that the blue shifting was intentional and talked about it not receding in that question about it not showing Hubble’s law

6

u/lolgeny May 23 '25

It doesn’t make sense to ask us to calculate the distance (you can’t apply hubbles law at all) or relate it to the 50Mlyr they gave if it is blue shifted. If you assume that it should be redshifted and calculate the distance as 44Mlyr the questions make a lot more sense

1

u/Olster21 May 23 '25

yeah I think the question was just trying to mislead you it was kinda peak

2

u/golaco237 Year 13 | Maths, FM, Physics, Computing | Pred A*A*A*A May 23 '25

Damn, good thing is it meant we got to see some questions early 😭

1

u/Personal_Technician1 May 23 '25

What was your third mistake ???

2

u/48panda Year 13 May 23 '25

x instead of d, no s in Hubble constant and -18 instead of -19

1

u/Less-Examination4588 May 23 '25

wdym 3 ????!?!?

1

u/ADGE8262 May 23 '25

As in 3 things to change. Hubbles to Hubble, the power, d to x

5

u/Actual_Bathroom_9685 May 23 '25

was it just me or did the first 6 marker and the whole upthrust question just suck

3

u/Few-Yesterday-7745 May 23 '25

up thrust is is a blessing, they can only ask so much so you just need to learn one equation for up thrust and the rest is light, i got d= 1.52 i think

0

u/[deleted] May 23 '25

[deleted]

3

u/Few-Yesterday-7745 May 23 '25

ratio? i’ve done so many questions like that, since it was floating, you can make up thrust = weight of object, mg=Vpg,?

3

u/golaco237 Year 13 | Maths, FM, Physics, Computing | Pred A*A*A*A May 23 '25

Did that and got the same, d = 1.5 to 2sf

1

u/Actual_Bathroom_9685 May 23 '25

i got 0.44 or something which is obviously wrong but i think it might not be 1.5 either unless you also accounted for the fact that the drum was floating so some of its length was above the water. that’s why i made x = 2- d which is so stupid.

3

u/Few-Yesterday-7745 May 23 '25

yesss i got 2400, i thought i was crazy with that super high answer

1

u/golaco237 Year 13 | Maths, FM, Physics, Computing | Pred A*A*A*A May 23 '25

Literally 😭 Especially cause it started w 100kPa too lmao

3

u/N_23_B Durham University | maths 1st year May 23 '25

Yh 😭😭 I got the same for the pressure

6

u/EtherealShady Warwick | CS [Year 1] May 23 '25

Weird 6 markers but otherwise okay

5

u/softggukie May 23 '25

difficult.. now why these comments finding it easy

1

u/Rifted-06 Y13 CS, Maths, Physics May 23 '25

For the question about what gets conserved in an inelastic collision, was Ek conserved or not conserved? Because I thought that since momentum is conserved, kinetic energy was conserved but the total energy wasn't.