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AQA Physics PHYA5 - 28th June 2016 [Exam Discussion Thread]

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Original post by MintyMilk
There are 2 neutrons coming out...


Hey could you help me with 7bii:https://e4cf8bb391554b7c9d8e0fc42269...ioactivity.pdf
Original post by MintyMilk
There are 2 neutrons coming out...


Ah yes, my mistake. Also just realised neutron rest mass is given in formula booklet, so you'd use that to find its binding energy
Original post by particlestudent


Beta decay 8 times more likely implies for every 8 beta decays, one electron capture occurs.
Given there is one argon atom --> 8 beta decays occurred.
Total number of atoms = number of beta decays + number of electron caputres + number of potassium atoms = 1+8+5=14 (in actuality the real total is some constant multiple of this number i.e 14A for some A, but this constant doesn't matter when finding t)
Model as N=Noexp(-lambda*t) for N=5, No=14
Get lambda from the half life, find t.
(edited 7 years ago)
Original post by Protoxylic
Beta decay 8 times more likely implies for every 8 beta decays, one electron capture occurs.
Given there is one argon atom --> 8 beta decays occurred.
Total number of atoms = number of beta decays + number of electron caputres + number of potassium atoms = 1+8+5=14 (in actuality the real total is some constant multiple of this number i.e 14A for some A, but this constant doesn't matter when finding t)
Model as N=Noexp(-lambda*t) for N=5, No=14
Get lambda from the half life, find t.


Thanks! I didn't realise that some of the potassium atoms would actually be remaining, that's where I got confused :smile:.
Original post by particlestudent
Thanks! I didn't realise that some of the potassium atoms would actually be remaining, that's where I got confused :smile:.


Np, this is a classic dating question probably the hardest thing they can ask you in nuclear.
Original post by Protoxylic
Np, this is a classic dating question probably the hardest thing they can ask you in nuclear.


Are you an A2 student too? I'm using that pack of questions to practice my Nuclear quickly, I don't know if they are pre2010 questions or new ones. Nuclear actually isn't that bad in my opinion :smile:
Original post by particlestudent
Are you an A2 student too? I'm using that pack of questions to practice my Nuclear quickly, I don't know if they are pre2010 questions or new ones. Nuclear actually isn't that bad in my opinion :smile:


Nah, I just finished my first year at Cambridge so I'm lurking around to help some people out :smile:
Original post by Protoxylic
Nah, I just finished my first year at Cambridge so I'm lurking around to help some people out :smile:


Oh right, that's good! :smile:
Thanks for your help, I'll ask you if I have any questions in the future :smile:.
Any resources for the Astrophysics option? We still haven't finished learning the course.. we finish tomorrow. Probably
Reply 149
Avatar for Lamassu
Lamassu
Original post by Samismad
Any resources for the Astrophysics option? We still haven't finished learning the course.. we finish tomorrow. Probably


http://www.antonine-education.co.uk/Pages/Physics_5_Options/Astrophysics/Option_%205A__astrophysics.htm
Reply 150
Avatar for Lamassu
Lamassu
Any Ideas on what the 6 marker will be?
(edited 7 years ago)
Original post by Samismad
Any resources for the Astrophysics option? We still haven't finished learning the course.. we finish tomorrow. Probably


I think Wahey Productions did it on youtube


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Original post by Lamassu
Any Ideas on what the 6 marker will be?


Hopefully an experiment for inverse square law for intenisty :tongue:


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Original post by Yo12345
Hopefully an experiment for inverse square law for intenisty :tongue:


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That would be a dream come true after the beautiful Unit 4 six marker!
Can someone please tell me how do you know when to use Q=mcT ?
Why do we use it for qs 1a on jun 2010 paper?
Please anyone help me
Original post by Samismad
Any resources for the Astrophysics option? We still haven't finished learning the course.. we finish tomorrow. Probably

The AQA textbooks for options, notes, past papers and questions by topic.
http://www.physicsandmathstutor.com/physics-revision/aqa-unit-5/
Original post by Yo12345
Can someone make a Turning Points thread? I can't do it on my phone :frown:


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Has someone set up a thread for turning points?!
Reply 157
Avatar for Nerrad
Nerrad
7
Can anyone explain this Electron Microscope diagram (Turning Points)
Q: https://gyazo.com/eb24307cdfe83fa99efceeb4db67c2c9
A: https://gyazo.com/f572ca14a77714ddaf8e76022f083fb6
Are those two paths the same? Why is one of the path reflected at A and then B, but the other path is only reflected at B?
Reply 158
Avatar for Nerrad
Nerrad
7
https://www.dropbox.com/s/81i2hxekqedbjnv/D2%20Wave-Particle%20Duality.pdf?dl=0
https://www.dropbox.com/s/ml0nqv52f1tolbr/D1%20Discovery%20of%20the%20Electron.pdf?dl=0
https://www.dropbox.com/s/cmhq4e50xaijsik/D3%20Special%20Relativity.pdf?dl=0
https://www.dropbox.com/s/f2vzr7kaqjpa345/Special%20relativity%20Min.docx?dl=0
https://www.dropbox.com/s/76joi3iswhypo9t/Turning%20Points%20Notes.PDF?dl=0
https://www.dropbox.com/s/ljj0utkv54jklbv/Unit_5D_-_Turning_Points_in_Physics.doc?dl=0
https://www.dropbox.com/s/m4d0pbm5en0spm7/Unit_5_-_Nuclear_and_Thermal_Physics.doc?dl=0
Some notes that I've accumulated for those who do turning points.
Also I'm making flash cards for turning points using the mark scheme and exam style questions, check it out.
http://www.cram.com/flashcards/phy5a-7323575
D3 Special Relativity.pdf601.0KB
Turning Points Notes.PDF422.9KB
Special relativity Min.docx294.2KB
Are fuel rods made of U235 or 238? Why doesn't fission work with 238?

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