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AQA Physics A - PHYA5 (18/06/12) - Exam thread

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Reply 60

NoFunnyBusiness

Original post by kimmey

can someone doing medical physics explain what and how an intensifying screen works for me :smile:

I didn't think we needed to know how they worked... :s-smilie:

Reply 61

kimmey

Original post by NoFunnyBusiness

I didn't think we needed to know how they worked... :s-smilie:

yeh im pretty sure we do haha, there's so much stuff to learn. do you know how to do the lens equation questions, if so can u help me i jus dont get them :frown:

Reply 62

NoFunnyBusiness

Original post by kimmey

yeh im pretty sure we do haha, there's so much stuff to learn. do you know how to do the lens equation questions, if so can u help me i jus dont get them :frown:

If you give me a question, I'll try, I sort of know (hate how there aren't as many past papers!). No guarantees though :redface:

Also re-applying for medicine this year! :P

Reply 63

NoFunnyBusiness

Original post by kimmey

yeh im pretty sure we do haha, there's so much stuff to learn. do you know how to do the lens equation questions, if so can u help me i jus dont get them :frown:

And something a little weird, got the same mark as you in Unit 4 physics :P

Reply 64

desijut

Time to start revising, yes... discovery of a nucleus mhm

Reply 65

HadrianH

Good luck to everybody taking this exam.

If anybody has material for Astrophysics, please send it my way!

Thanks

Reply 66

sillehcaptcha

Original post by davey.gravey

for people doing astrophysics section, I have the online textbook for the 3 chapters of cosmology, telescopes and surveying the stars. these cover everything, its basically an unprinted textbook for astrophysics (:

Anyone got any answers for the said "online textbook" *sigh* *facepalm*

Do not understand why the answers for AQA textbook answers are so hard to find...

Reply 67

desijut

After an hour and a half, i think radioactivity is quite nice :smile:

rate of decay, properties, etc, will go over some more and do some questions before i move on

Reply 68

R1Charles

So just been checking what I need to revise with the Specification and was a bit confused to see we are expected to know the experimental verification of the inverse square law for gamma radiation.

Any ideas what sort of question they could ask on this? I'm guessing its to do with energy spreading out isotropically, over the surface of a sphere etc..?

Reply 69

Insanity514

Does anyone doing astrophysics actually feel confident with the 6 markers?
My teacher hasn't taught the points need to gain at least 4 marks in the 6 markers for the june 2010 and the june 2011 paper :angry:

Does anyone else feel like this or is it just my teacher?

Reply 70

gukl

Long shot but...Jan 03 PHA7/W (U5 option c) Question 4b?

calculate input power?

Given- Area enclosed by indicator diagram loop = 490J
Rotational speed of output shaft = 1800revmin-1
- 1 cyclinder

Mark scheme says: 1800/(60x2) = 15revs-1, work output each cycle = 380J?! (no idea where this comes from which loses me) so indicated power = 15 x 190 = 5700?

Completely lost agh!

EDIT: NEVERMIND ERROR IN THE QUESTION ACCORDING TO THE EXAMINERS REPORT. GAH.

(edited 11 years ago)

Reply 71

desijut

Original post by R1Charles

Was just doing this, it rings a bell. I think you use a GM (geiger-muller) tube and compare intensities at different distances and it should be such that I is proportional to 1/x^2

could be wrong but anyway, a 6 marker could be. Describe the experiment used to verify the inverse square law for gamma radiation, or something along those lines

Reply 72

skibur

Original post by Insanity514

Does anyone else feel like this or is it just my teacher?

Yeah, I agree, I think astro is on a whole quite a bit harder than the other section. I REALLY struggle with telescopes wahh :frown:

Reply 73

Insanity514

Original post by skibur

Yeah, I agree, I think astro is on a whole quite a bit harder than the other section. I REALLY struggle with telescopes wahh :frown:

I know telescopes :frown:

Reply 74

skibur

what are the grade boundaries like for this exam? I couldnt find them on AQA

Reply 75

her17

Original post by insanity514

i know telescopes :frown:

i hate telescopes

Reply 76

Insanity514

Original post by her17

i hate telescopes

What did telescopes ever do to you :s-smilie:

Jokes aside yeh the **** me off but I went through them and now its not so bad.

Reply 77

desijut

Original post by skibur

what are the grade boundaries like for this exam? I couldnt find them on AQA

http://web.aqa.org.uk/UMS/index.php

Qualification: A2
Series: June10/11
Unit: GCE Physics 5A or 5B or 5C or 5D

5A=Astrophysics
5B=Medical Physics
5C=Applied Physics
5D=Turning Points in Physics

Reply 78

gimboid

anyone got or know where the specimen is?

Reply 79

Machoo

I'm really struggling with Astrophysics. It's the only thing that's letting me down really. I haven't done Chemistry for a long time, and I was exactly very good at it, so Absorption lines aren't a speciality of mine.

Anyone have any idea where I could fine some good revision notes on Absorption lines which is up to the standard of A2 work, without actually purchasing a Chemistry text book?

How's everyone finding the rest of Astrophysics?