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# AQA Physics PHYA5 - Thursday 18th June 2015 [Exam Discussion Thread] watch

1. (Original post by MSB47)
Yeah and that can be displayed as I=k x 1/x2 then sub in K=Io/4pi and that makes the equation...

I=(Io/4pi) (1/X2)
Are you sure k isn't just equal to 1/4pi because Io is already in the equation here.... Not that it matters but if it was Io/4pi then you'd end up with Io squared on top
2. (Original post by ricardomontoya97)
No but I think we're up to date with the books now? so no-one knows what going to happen! haha But really the red lady will revive Jon Snow, quite obvious I think
I dont watch the TV series i just assumed you knew that from the books haha,

damn i really need to watch it sometime
3. (Original post by ricardomontoya97)
No but I think we're up to date with the books now? so no-one knows what going to happen! haha But really the red lady will revive Jon Snow, quite obvious I think
Kill the boy, and let the man be born.
4. (Original post by Dante991)
Astrophysicists, what are your guesses for the 6 marker? I hope it's something really nice like fusion occurring in stars lol

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what do you mean by fusion occurring in stars exactly?
Hoping it's refracting vs reflecting telescopes for the six marker to be honest
5. (Original post by Plasmapause)
Please could someone explain how to do 4bii?
1) calculate energy of copper

2) calculate how much energy has been used to warm water to 100 degrees

1) takeaway 2) would give you energy left
6. (Original post by a.a.k)
1) calculate energy of copper

2) calculate how much energy has been used to warm water to 100 degrees

10 takeaway 2) would give you energy left
Oooooh... I get it now. Thanks!
7. Anyone still stuck on ideal gas derivative?
Watch this amazing video by Bob Eagle and it'll be so so clear! Takes like 4 minutes. https://youtu.be/JOs8UQSWmos

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8. (Original post by examiningboard)
I'm thinking proof for the expansion of the universe
What do you mean by this? Hubbles law compared to using 1a supernovae as standard cradles and using m-M=5logd/10?
9. Can someone explain this question please

The Treptow Giant Telescope in Berlin is the longest moveable refracting telescope on
Earth. Some of its properties are summarised below:

distance between the objective lens and eyepiece lens = 21 m
angular magnification = 210
objective lens diameter = 0.68 m

1 (b) (i) Calculate the focal lengths of the eyepiece lens and objective lens of the Treptow Giant
Telescope
10. (Original post by JJBinn)
What do you mean by this? Hubbles law compared to using 1a supernovae as standard cradles and using m-M=5logd/10?
Yeah, it was on in 2010 I think. It's quite a nice easy one, keeping fingers crossed!
11. Feel confident for this exam. Unit 5 is my strong point, and I've managed to get 120 UMS on every past paper under exam conditions. However, I was confident for the Unit 4 one and that went awfully, so I am a little on edge! I feel like the six markers could be horrible

I'm also too worn out to revise, this is my 11th and final exam. Anyone in a similar situation?
12. The 'previous 6 markers' bit isn't showing anything?
13. http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF

Question 1)b) ii)

Why do you not include the neutrons in the binding energy calculation?
14. (Original post by Mehrdad jafari)
Sorry guys, i think i spammed the poll. It was my first time voting so i think it was my fault. I didn't even know that would happen. I'm sorry for any inconvenience caused.

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How do you manage to accidentally spam a poll with 1000 votes? o.O What makes you think you caused it?
15. (Original post by Whateverisbest)
http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF

Question 1)b) ii)

Why do you not include the neutrons in the binding energy calculation?
ffs
16. (Original post by Whateverisbest)
http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF

Question 1)b) ii)

Why do you not include the neutrons in the binding energy calculation?
How would you include the neutron ? Their binding energy is zero, its not a nucleus
17. Can anyone please help me understand how the magnitude formula is used in real world? So if you have apparent magnitude and distance you can get absolute magnitude and compare it with other stars. Great. But how did you get apparent magnitude and distance in the first place? How does it fit with Wien's law, Stefan's law, spectral classes, intensity formul all that good stuff?
18. (Original post by RobHunter97)
Feel confident for this exam. Unit 5 is my strong point, and I've managed to get 120 UMS on every past paper under exam conditions. However, I was confident for the Unit 4 one and that went awfully, so I am a little on edge! I feel like the six markers could be horrible

I'm also too worn out to revise, this is my 11th and final exam. Anyone in a similar situation?
Similar! 11th and not final exam :| Fortunately it's just M2 left on Monday after this so I can finally relax after tomorrow. I'm sure it'll go fine for you good luck!
19. (Original post by NightStrider)
How would you include the neutron ? Their binding energy is zero, its not a nucleus
Ok now i am confused.
Attachment 431393

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Attached Images

20. For June 14 question 1bii, why do you not include the binding energy of the neutrons?

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