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

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Reply 2680

jf1994

Original post by sophiebeth100

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That sounds much more logical, but I expected to screw up the lens equation anyway. :frown:

how did you find the rest of the medical paper?

I thought it was pretty good, I did kinda panic on the question about sound, but ended up guessing that the straight line was the dB scale because intensity is uniform across the whole range of frequencies and the curved line was dBA because it accounts for the sensitivity of the ear, one of the points on the curve was the threshold of hearing at 1000Hz and the other point was the frequency at which the human ear is most sensitive

Reply 2681

dominicwild

Original post by wat a wizard

anyone doing astro get 15m diameter for the cassegrain

Yep

Reply 2682

Ilovemaths96

Original post by 000alex

Feel sorry for the examiner that gets my papers, both of my 6 markers had 20% full of scribble and crossed out
We were supposed to do this?

yeah but i didnt draw graph explained it

Reply 2683

superduperbob

Original post by 000alex

Feel sorry for the examiner that gets my papers, both of my 6 markers had 20% full of scribble and crossed out
We were supposed to do this?

I did this but with volume against tempt as it is easier to measure than pressure

Reply 2684

StarvingAutist

Original post by wat a wizard

anyone doing astro get 15m diameter for the cassegrain

Yep, I think so :smile:

Reply 2685

Sbarron

Now I'm far from the best student so DON'T go by these values but I just want to see if anyone got any the same as me.....

Nuclear and thermal:
0.05, 5.00
1.4*10-15 m
5.3*10-15 m
1.3*10^17 kgm-3
3.3*10-6 s-1
8.2*10^11
47000J
160000
319 K

Astro:
2.4*10^11
15m
-82
5000 K
97*10^6
8.8*10^21
4.9*10^17

Reply 2686

superduperbob

Original post by StarvingAutist

-8.7*10^-3

seems wrong but whatever

I got that

Reply 2687

simonli2575

Original post by wat a wizard

anyone doing astro get 15m diameter for the cassegrain

and poor detail?

Pretty sure you're supposed to use llamda = 1.0 micrometer because they gave the smallest resolving power of the telescope.

Reply 2688

jf1994

Original post by HenryHein

Yes, like 000alex' sketch but in words (also explained you could plot P against T as well), so with V against t pressure was constant and P against T, V was constant

What a guess!

Reply 2689

dominicwild

How did you find the radius of that nucleus we were given?

Reply 2690

Ilovemaths96

Original post by lad123

Anyone else get 47233 so 47000 on the latent heat one

yeah

Reply 2691

IWantSomeMushu

I ****ed up the absolute mag question because I thought the 0.009 or whatever value was too low and wasn't sure whether to use metres of parsecs for d :facepalm2:

Really pisses me off that I had it but chose to write some other ****ed up value using metres....

Reply 2692

superduperbob

Original post by bwr19

Yes that's what I got! A very small negative.

Think I put this in my calc:

1.981 - 5log(25/10)

??

That's what I did too

Reply 2693

Ilovemaths96

Original post by dominicwild

How did you find the radius of that nucleus we were given?

use the formula?

Reply 2694

superduperbob

Original post by Ninja_heel

What was the star is astro?

Main sequence
Giant
White dwarf

I put main sequence

Reply 2695

lad123

Original post by Sbarron

For the one you got 160,000 i thought you were supposed to square them first then add them, and then divide by 3?

Reply 2696

HenryHein

Original post by dominicwild

How did you find the radius of that nucleus we were given?

[your value of r0] * cuberoot54 or whatever A was

Reply 2697

SuperMushroom

For the first question on astro as it gave the distance from the sun in AU and it wanted the distance to the earth so do you take away 1AU from the largest distance given and this would give the distance to the earth

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