Thanks Caz; I think me and you have the same exam timetable by the way...(Original post by _Caz_;[url="tel:57110427")
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AQA Physics PHYA5  Thursday 18th June 2015 [Exam Discussion Thread] Watch

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 1921
 17062015 07:39

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 1922
 17062015 07:46
(Original post by Fvthoms)
Thanks Caz; I think me and you have the same exam timetable by the way...
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 1923
 17062015 08:01
(Original post by Me123456789)
Oh, that makes more sense now, thanks
(Original post by frankiejayx)
Is magnification Beta / Alpha ?
Also is it only mirrors that suffer from spherical abberation??
â€¢ Image height divided by object height
â€¢ Image distance divided by object distance
â€¢ Angle subtended by the image to the eyepiece lens divided by the angle subtended by the object to the unaided eye (beta over alpha!)
Reflecting telescopes are the only ones to suffer from spherical aberration but this can be solved by using a parabolic mirror.
(Original post by JJBinn)
How do you know that? It says the molten lead starts at 327 and the iron finishes at 84. I don't understand why you can deduce that the final temperature is therefore 32784? It's probably really basic just don't see it
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 1924
 17062015 08:08
Thie iron finishes at 84 but the Molten lead does not finish at 84 though if it's change in temperature is 32784? That would be 243? So confused haha.
Just realised how much of an idiot I am, that's the difference between 84 and 327 ahaha what a bad mistakeLast edited by JJBinn; 17062015 at 08:38. 
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 1925
 17062015 08:15
(Original post by _Caz_)
I kinda noticed you keep popping up everywhere haha! Have you got fp2 on Monday as well?
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 1926
 17062015 08:21
Can anyone explain how the electron diffraction experiment shows how big or small a nucleus radius is? especially how the minimum angle is relevant.

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 1927
 17062015 08:22
(Original post by CD223)
Reflecting telescopes are the only ones to suffer from spherical aberration but this can be solved by using a parabolic mirror.
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 1928
 17062015 08:26
(Original post by Fvthoms)
Nah, S2 and then I'm finished. To be honest though, in my mind I'll be done once PHYA5 is over.
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 1929
 17062015 08:27
For the inverse square law... Is d always in parsecs?

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 1930
 17062015 08:35
(Original post by _Caz_)
I've not done any fp2 revision in a while to be honest so I've got my work cut out after physics 5. Good luck for s2, I mean I'm not sure what board you're on but my s2 paper a few weeks ago was nice enough so I'm hoping its the same for you! How are you feeling for physics 5?
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I haven't looked at S2 for two months; done a past paper a few days ago and scraped the boundary for an A, but I definitely have my work cut out me in Stats aswell. 
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 1931
 17062015 08:35
(Original post by ubisoft)
Yeah but I said same isotopes? All same isotopes have same decay constant?
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 1932
 17062015 08:39
(Original post by muyiwaaiyenuro)
Can anyone explain how the electron diffraction experiment shows how big or small a nucleus radius is? especially how the minimum angle is relevant. 
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 1933
 17062015 08:51
(Original post by Fvthoms)
How I feel for Unit 5... driven is the word. Went into the PHYA4 overconfident and unfocused; did well in the MC (23/25) but made a mistake on pretty much every written question . Need to get those marks back to keep the A.
I haven't looked at S2 for two months; done a past paper a few days ago and scraped the boundary for an A, but I definitely have my work cut out me in Stats aswell.
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 1934
 17062015 09:02
In using the formulae for kinetic energy of gas's and molecules, can somebody clarify the crms speed? If we are given a speed called the root mean square speed, we square this before using it in the formulae? And if we are given the mean square speed, we can use it straight away right?
What about if it just said the average speed of the molecules is x. Would you square x or would you be able to put it straight in? 
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 1935
 17062015 09:06
(Original post by _Caz_)
Good luck! I think you'll manage the A! (For both exams that is)
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 1936
 17062015 09:07
(Original post by JJBinn)
There's a formula, sinx=1.22lambda/d where d is the diameter of the nucleus, lambda is the wavelength of the electron beam and x is the angle between the first minimum and the line of the electron beam. 
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 1937
 17062015 09:09
(Original post by muyiwaaiyenuro)
I know that, but is there any derivation/reason for why this is? 
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 1938
 17062015 09:17
(Original post by JJBinn)
Well there will be but it's not required for the exam, just make sure you understand the formula and can describe how it can be used in an experiment to determine the radius/diameter of a nucleus 
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 1939
 17062015 09:24
Hi I was just wondering could someone help me with this. I've done most of it right. The previous part I got and I got half way through part ii) But when it asks for how many tines better it is I don't know where they got the 1.2x104 part from in the working? I've attached pictures of the question and the answers in this post. If anyone has any idea where they got the 1.2x104 from it would be a great help because I've tired everything. I've even tried just mindlessly trying to multiply/divide numbers from the question but I can't get 1.2x104 out? What am I missing?
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 1940
 17062015 09:26
Can someone help me with 3bi on june 2012, no idea where that method comes from
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