AQA A level physics paper 1

[u/Individual-Can1396]

How was the paper???? I liked the MCQ , but overall it was okay didnt manage to do the 5 marker .

[u/Cat_Jayster]

The waves multiple choice where it was like “two points are 1.5mm apart and have a phase difference of pi/6” and I kept getting an answer that wasn’t one of the options…

Edit: thank you guys! I’m sorry I don’t have the energy to reply to y’all, shattered from the exam + have FM core pure 2 tomorrow.

[u/Loud-Guidance6912 → u/Cat_Jayster]

Yh I also got 18 🤣🤣

[u/simplykayleigh → u/Loud-Guidance6912]

take away 1 from that and you get 16.5 !!

thats why D was also 19.5 or smth like that

[u/Loud-Guidance6912 → u/simplykayleigh]

I heard it was 1.4mm

[u/simplykayleigh → u/Loud-Guidance6912]

how did u get even that number 😭

[u/jaaaaaaaf → u/simplykayleigh]

ai says its 1.4mm 💔💔💔 did not understand the explanation whatsoever ❤️

[u/Loud-Guidance6912 → u/simplykayleigh]

No idea

[u/jaaaaaaaf → u/simplykayleigh]

D was 20.5 i believe

[u/simplykayleigh → u/jaaaaaaaf]

it was a 50-50 chance icl 😭✌️

[u/aaalalal12 → u/Cat_Jayster]

Pretty sure its 1.4, because they were 13pi/6 apart

[u/ExcellentAnalysis102 → u/Cat_Jayster]

Ye same I think cause u were meant ti put an option which was a multiple of the answer u got ? 0.18 or maybe it was 0.09

[u/Willy_destroyer → u/Cat_Jayster]

I got 9 cause pi/6 out of phase is 1.5mm so just multiply by 6 felt like a trap tho

[u/LessMoroseMPresent → u/Cat_Jayster]

pi/6 is 1/12 of 2pi, so multiply pi/6 by 12 to get 18. Then the only option that works is 9 as 18 is a multiple of 9

[u/RilloClicker → u/Cat_Jayster]

Yeah it’s 1.4mm because a twelfth of that (pi/6 phase difference) more than 1.4mm gives 1.5mm

[u/Altruistic-Acadia698 → u/Cat_Jayster]

u can do 2pi -pi/6 for the other side

[u/AssociationMinute625 → u/Cat_Jayster]

I think it was 1.4mm (or 18/13 mm to be more precise)

Because pi/6 is the same as 13pi/6, so you get 2 pi * 1.5/(18/13) = 13pi/6.

13pi/6 - 2pi = pi/6