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

Only just got in because half of my friends are celebrating finishing their exams ( :'( ), thought it was a pretty lovely paper though overall! Liked the six markers a lot, they were so nice. Made at least 1 stupid mistake that I know of so far but oh well.

Reply 3281

Puzzled_Logician

9

Original post by CD223

I agree. The actual paper for C4 wasn't difficult I just dropped quite a few marks. Praying for 180 :s-smilie:

I'm not religious :wink:

but after chemistry this year, I just need to hope, and 'pray' for the grades I need for Bristol...

Also like me and physics 4 then....

Reply 3282

StarvingAutist

17

Original post by roar96

Right, well now that's over... SUMMER!

Shut up; I still have three exams :frown:

Reply 3283

Emmanuel12344

2

Original post by Puzzled_Logician

I think you square each value (of speed) and divide through by 3 then, to get the Crms^2

It's was 1 mark right

Reply 3284

Sam.B57

2

Original post by Puzzled_Logician

Yeah; for CHEM4 I found I run out of time, too many questions of typical difficulty where you'd normally have 9.

But none of my exams stick out as going drastically badly to be honest..

Both Chemistry papers I found okay, and only really 2 out of 10 of my exams so far have gone bad, all in all they've gone well enough for uni

Reply 3285

CD223

OP

10

Original post by Lau14

Only just got in because half of my friends are celebrating finishing their exams ( :'( ), thought it was a pretty lovely paper though overall! Liked the six markers a lot, they were so nice. Made at least 1 stupid mistake that I know of so far but oh well.

What mistake? I made several?:/

Reply 3286

Puzzled_Logician

9

Original post by Emmanuel12344

It's was 1 mark right

Just 74 more to go...

Reply 3287

Lau14

11

Original post by CD223

What mistake? I made several?:/

I must have done a typo for calculating the radius of that star because my answer was the one I heard from all my friends but to the power 8 so out by a factor of 100 or so :/ which means my tick box (dwarf, giant, main sequence) was wrong so hoping for some follow through there! Haven't found any other mistakes that I made yet but I'm sure there are some

Reply 3288

Disney0702

9

Original post by QueNNch

Density = m/V
Calculate volume from 4/3πr^3
Take r from previous question.

Posted from TSR Mobile

Did u use m = 51?

Reply 3289

Disney0702

9

Original post by king cobra

No proton number is same

Posted from TSR Mobile

But the neutron number changes so wouldn't the nucleon number be bigger or smaller so the size of the nucleus should be different.

So shouldn't the dispersion be different?

Reply 3290

greetingsfrenz

6

astro was definitely harder than last years in my opinion

Reply 3291

StarvingAutist

17

For the 6-mark astro question, did you have to actually calculate T and v, or did you just have to explain how they would be calculated? I explained both in some detail, but didn't produce values.
Did the question specify that you had to calculate them, or did it simply ask how you'd evaluate them?

Reply 3292

superduperbob

1

Original post by Disney0702

Did u use m = 51?

51 times the mass of a neutron or proton

Reply 3293

Lau14

11

Original post by StarvingAutist

For the 6-mark astro question, did you have to actually calculate T and v, or did you just have to explain how they would be calculated? I explained both in some detail, but didn't produce values.
Did the question specify that you had to calculate them, or did it simply ask how you'd evaluate them?

It said to do suitable calculations in the question so you should have actually done them I think

Reply 3294

Disney0702

9

Original post by TheRAG

Did we all get 318/320K for the last (Part A) Q on temperature of a gas?

I did!

Reply 3295

Igooo

2

Original post by Disney0702

I did!

Yep

Posted from TSR Mobile

Reply 3296

Disney0702

9

Original post by superduperbob

51 times the mass of a neutron or proton

Oh! Oooops :colondollar:

Reply 3297

OprahWinfrey

For astro, m-M= 5 log d/10 is d measured in parsecs?? I converted into parsecs and idk if i should have :///

Reply 3298

CD223

OP

10

Original post by Lau14

I must have done a typo for calculating the radius of that star because my answer was the one I heard from all my friends but to the power 8 so out by a factor of 100 or so :/ which means my tick box (dwarf, giant, main sequence) was wrong so hoping for some follow through there! Haven't found any other mistakes that I made yet but I'm sure there are some