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# Edexcel Unit 4: Physics on the Move 6PH04 (11th June 2015) watch

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1. (Original post by ertuu)
To cerlohee

For your question about dividing by two, I think you use the fact that energy is conserved. So the total energy (after the decay) is calculated to be around 300 GeV. This means the total energy before the decay was also 300 GeV. This initial energy was comprised entirely of two (identical) top quarks, i.e. they both have the same amount of mass-energy. Thus, you divide by 2 to get that the mass of one top quark is 150 GeV/c^2. I hope that makes sense.
Ahh that makes loads of sense thank you!

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2. (Original post by iceangel8)
Is the answer 1.61MeV each per gamma photon, or 2.58x10^-13 J? If it's right I'll explain but not sure
Yes it is pls PM me
3. (Original post by physicsmaths)
This is wrong,
Conventional current in this case from FLHr is direction of the conductor the force on the positive charge is towards the right and that's why the right tip. Not due to the current finger in FLHR.

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So if youre third finger points right, does that mean its positive?
4. Guys i dont understand this question from Jan 2015 IAL
im using FLHR and i'm getting my current from south to north

5. (Original post by spacehopper123)
So if youre third finger points right, does that mean its positive?
Your third finger should point into the page. Your thumb should point to the left - this means that the electrons move to the left leaving the right side with a positive charge.
6. (Original post by ertuu)
Your third finger should point into the page. Your thumb should point to the left - this means that the electrons move to the left leaving the right side with a positive charge.
I dont understand
Can you please explain with a diagram
7. (Original post by physicshelper)
Guys i dont understand this question from Jan 2015 IAL
im using FLHR and i'm getting my current from south to north

Hi there

The force must be acting upwards to balance the weight out

The magnetic field is from left to right

Therefore using FLHR current is pointing towards us, north to south

Cheers
8. (Original post by physicshelper)
I dont understand
Can you please explain with a diagram

This was meant for spacehopper123. Not physicshelper.
9. (Original post by denizcan619)
Hi there

The force must be acting upwards to balance the weight out

The magnetic field is from left to right

Therefore using FLHR current is pointing towards us, north to south

Cheers
I totally understand but doesnt the 3rd finger show the direction of conventional current which flows in opposite direction to flow of electrons?
10. (Original post by physicshelper)
I totally understand but doesnt the 3rd finger show the direction of conventional current which flows in opposite direction to flow of electrons?
You are correct. However, the question only asks for the direction of the (conventional) current, not the direction of motion of the electrons.
11. How is revision going peeps?
12. guys i have a question. like in the June 2014(r) and i saw it in another paper as well, question 13b)ii) why does the MS say "(show that value gives 6.63 × 10^−11 m) ?! i feel like theres some obvious thing im not getting..
13. (Original post by imnoteinstein)
guys i have a question. like in the June 2014(r) and i saw it in another paper as well, question 13b)ii) why does the MS say "(show that value gives 6.63 × 10^−11 m) ?! i feel like theres some obvious thing im not getting..
Using the value from the previous show that gives that value of de broglie wavelengthv

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14. (Original post by Freddy-Francis)
How is revision going peeps?
Did 2 past papers and some notes in total... so yeah

EDIT: the past papers went great though
People who did June 2013, did you find the paper hard or easy?
15. (Original post by Karoel)
Did 2 past papers and some notes in total... so yeah

EDIT: the past papers went great though
People who did June 2013, did you find the paper hard or easy?
Ive done 5 so far. Maybe a few more today. I only started revising this week 😁.

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16. (Original post by Karoel)
Did 2 past papers and some notes in total... so yeah

EDIT: the past papers went great though
People who did June 2013, did you find the paper hard or easy?
oh nice. I am in the progress of learning by heart the last topic. I got past papers to do after
17. (Original post by physicsmaths)
Ive done 5 so far. Maybe a few more today. I only started revising this week 😁.

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I only started yesterday
18. Very worried about this paper Anyone know how the Unit 2 went? A low A would be nice! I've done all the papers and some even twice but some questions can still throw me
19. (Original post by iceangel8)
Very worried about this paper Anyone know how the Unit 2 went? A low A would be nice! I've done all the papers and some even twice but some questions can still throw me
Unit 1 was easy.
Unit 2 was ok. Average paper.
20. (Original post by Freddy-Francis)
Unit 1 was easy.
Unit 2 was ok. Average paper.
So maybe they'll make A2 nasty? haha

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