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A2 6PH04 Physics Unit 4 'Physics on the Move' - 11th June 2012

i predict that the grade boundaries will be pretty much the same

Yeah, I guess it will be around the same as the last papers, so you can lose around 20 marks and still get an A*, which is stupid, but awesome at the same time.

Reply 381

Hasi.ali

Quick question guys...
What did people do for the question with the capacitor and the 400hz??? :s-smilie:

Reply 382

hotheadhacker

Original post by Hasi.ali

Quick question guys...
What did people do for the question with the capacitor and the 400hz??? :s-smilie:

find time constant and compare with 1/400...time constant wld b smaller so it discharges completely before flicking back to X from Y

Reply 383

Hasi.ali

Original post by hotheadhacker

find time constant and compare with 1/400...time constant wld b smaller so it discharges completely before flicking back to X from Y

Do u not have to use the 5RC rule for charge and discharge?

Reply 384

psychojonas

11

Original post by xA-A-Ax

I thought it was inelastic...so I think I put an option about KE NOT being conserved?

You're right, an inelastic collision is one where kinetic energy is not conserved and an elastic collision is one where kinetic energy is conserved.

Reply 385

randereen

Has anyone got the paper and unofficial mark scheme? Thanks :smile:

Reply 386

lion_claw1

Original post by hoobaha

What did people out for the 2 reasons he can't just replace Ee with Bev? I put
- the force from a magnetic field acts perpendicular so won't affect vertical velocity
- the magnetic field will affect horizontal not vertical velocity, the mass will affect vertical velocity

I understand I was rambling and repeating myself a bit but I just didn't know what else to put!

i think u had to write tht . since F=EQ ,k so he replaced it by F=beq . not sure . but he did tht. stupid guy -.-

Reply 387

lion_claw1

paper wasnt tht hard. hve still nightmare of jan 2012 paper =p this was easier. though few tough question

Reply 388

psychojonas

11

Original post by theandyguthrie

well if positive particles are repelled when inside it's field - the field must be directed away from the sun. Therefore positive.
I wasn't 100% on how to phrase it nicely.

I put something about there being electrostatic repulsion between the particles in the Sun and the positively charged particles going away from the Sun, hence proving the Sun is positively charged... Would that be right?

Reply 389

Alexok

8

On the last MCQ, there was a question on which equation would be possible if a pion decayed or something, i remember getting A because the charge conservation. But D had charge conserved but also had a pion on the other side of the equation.. ? anyone know what the correct answer was?
Edit: i have found out the answer and its D probably because of lepton number!! noo i was soo close to doing thatt

(edited 11 years ago)

Reply 390

FallenDeath

This is all I remember:

I went.
I sat the paper.
Came out thinking which way my home was located.

The paper wasn't terrible but not easy either. Its somewhere in the middle. But yet i have this funny feeling that it was actually hard. :s-smilie:

Reply 391

FDR

10

Original post by Hasi.ali

Quick question guys...
What did people do for the question with the capacitor and the 400hz??? :s-smilie:

I'm not sure I got that right - I worked out the time constant, then said that it takes about 5 Time constant's to charge, and 5 to discharge, so worked out the time for 10 Time constants as the time taken to charge and discharge, then divided that by 1 to get the frequency, and ended up with a value of 454 Hz

Reply 392

Alexok

8

What is the role of electric fields in a bubble chamber? I only thought magnetic fields are used in a bubble chamber :s-smilie:

Although i did say they are used to slow the particles down before they enter the chamber ...

Reply 393

Alexok

8

No where in the book does it explain how electric fields are used in the bubble chamber..

Reply 394

FDR

10

Original post by Alexok

No where in the book does it explain how electric fields are used in the bubble chamber..

I know, Edexcel exams really piss me off like that, because they ask a lot of questions which you just can't prepare for. I had no idea (and still don't) of what an electric field is used for in a particle detector, so I pretty much made something up and hoped it would stick, and tried to get as many key words in there as I could in the hope of finding marks - I said it was used to speed the particles up so they would experience relativistic time dilation, and that it also helped cause ionisation and cause the particle tracks to show up clearly. I still think what I wrote was BS.

Reply 395

theandyguthrie

10

Original post by Alexok

No where in the book does it explain how electric fields are used in the bubble chamber..

are electric fields used in the bubble chamber?

I presented this topic to my class and as i recall there aren't any electric fields. They use electric fields in spark and drift chambers - which is what i wrote.

Reply 396

Mtice

Anyone remember what the total amount of marks were for each question (especially 15, 16, 17 and 18)?

Reply 397

Yorrap

2

Original post by FDR

I know, Edexcel exams really piss me off like that, because they ask a lot of questions which you just can't prepare for. I had no idea (and still don't) of what an electric field is used for in a particle detector, so I pretty much made something up and hoped it would stick, and tried to get as many key words in there as I could in the hope of finding marks - I said it was used to speed the particles up so they would experience relativistic time dilation, and that it also helped cause ionisation and cause the particle tracks to show up clearly. I still think what I wrote was BS.