OCR Physics A G485 - Frontiers of Physics - 18th June 2015

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Reply 1580

Flux_Dubstep

Not sure how it went really. Easier than expected but then again I was expecting the worst

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Reply 1581

Devran22

Original post by seizetoday

1.4*10^10ly

Years not light years

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Reply 1582

Tiwa

Such a great paper! :biggrin:

Reply 1583

pje1000

Original post by BrokenS0ulz

13.4 activity
64% transmitted ultrasound
1.8x10^-3 average current
520 Ks^-1 for the heating thing
16 for ratio of ke
?

Did you multiply by 0.99 for the energy on that one? As only 99% was converted to heat?

Reply 1584

username1060297

Original post by jcwh97

LOL exams aren't meant to be fun :tongue:

I actually found a few of the topics in G845 quite enjoyable!
What did you think of the paper?

Ah I get bad grades but when the stuff's interesting my attention is so much better hence the disappointment :frown:

Reply 1585

Help_Me_Alex

For the ratio of the power one did anyone get a big number as in 10^(+), friends are saying they got 10^(-)

Reply 1586

seizetoday

Original post by Devran22

Years not light years

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Yeah that's what I meant.

Reply 1587

Leechayy

Original post by pje1000

Did you multiply by 0.99 for the energy on that one? As only 99% was converted to heat?

Multiply by 0.01 as only 1% is actually applied to the photon

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Reply 1588

BrokenS0ulz

Original post by pje1000

Did you multiply by 0.99 for the energy on that one? As only 99% was converted to heat?

Yeah to get energy = 712.8 I yhink

Reply 1589

username1060297

What are people predicting the grade boundaries will be?

Reply 1590

jcwh97

Original post by Help_Me_Alex

For the ratio of the power one did anyone get a big number as in 10^(+), friends are saying they got 10^(-)

I got an answer of 10^7 which im confident with

Reply 1591

seizetoday

What did you guys get for the light years question?

Reply 1592

xy0mz

Original post by Genty Boy

I didn't really know what to do for the sketch. For the first one I did an exponential with asymptotes of x=0 but then for the second one about heat I just made it not go down so fast exponentially in comparison to the other.

What did you guys do?

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I did the heat one below because its potential divider circuit so V decreases

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Reply 1593

BrokenS0ulz

Original post by Leechayy

Multiply by 0.01 as only 1% is actually applied to the photon

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It was asking for the heat energy transferred ?

Reply 1594

jcwh97

Original post by Leechayy

Multiply by 0.01 as only 1% is actually applied to the photon

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That was for the second part

Reply 1595

Leechayy

That all nighter paid off so much, physics went well. :redface:

The capacitor question + the CAT scan question threw me off a little though

But since the paper overall wasn't that bad, it'll probably be mid 70s for an A.
Which means mistakes will be the death of me :colonhash:

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Reply 1596

L'Evil Fish

Original post by Help_Me_Alex

For the ratio of the power one did anyone get a big number as in 10^(+), friends are saying they got 10^(-)

10^7 ish

Reply 1597

Help_Me_Alex

Original post by jcwh97

I got an answer of 10^7 which im confident with

did you get that with P = (T^4) x (r^2) ?

Reply 1598

jcwh97

Original post by Ki Yung Na

Yeah fair enough I have found g485 the most interesting out of everything I do. For me the exam was good but waiting for that uno. mark scheme :biggrin:

Reply 1599