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

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can someone run me through the current for the capacitor. I did q=vc = 1.4*6.6x10-6 divided by time which was 1/120 and ended up with 1.16x10^-3

I also did this, but not sure if it is right!

Reply 1641

NJ4769

Original post by gothmog827

can someone run me through the current for the capacitor. I did q=vc = 1.4*6.6x10-6 divided by time which was 1/120 and ended up with 1.16x10^-3

I did exactly the same, not sure if its right though.

Reply 1642

Elcor

What did people say for the energy released from beta decay, and the average current when the frequency doubles?

Reply 1643

gothmog827

Original post by kateyl

How did you get to the answer 64% intensity?

so use the eqn for Ir/I0. let z2 = 4z1 so (4z1-z1)^2/(4z1+z1)^2 = 9/25. 1- this for the intensity transmitted :smile:

Reply 1644

username1920701

Original post by kateyl

How did you get to the answer 64% intensity?

it said intensity passing through NOT reflected, so you must minus the reflected percentage (36) from full percentage (100) to get intensity passing through

Reply 1645

Elcor

Original post by Lunox

I also did this, but not sure if it is right!

I got 1.8x10^-3 amps :/

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Reply 1646

Jackasnacks

where the bledy hell was mri star formation carbon dating
yep nope chuck in about 97 ratio questions instead then

wasn't nearly as vile as g484 so there is hope

Reply 1647

fatart123

Well, I thought that 100 - 36 = 54... Whoops

Reply 1648

L'Evil Fish

Original post by Elcor

What did people say for the energy released from beta decay, and the average current when the frequency doubles?

I said neutron to proton

So decrease in mass

Mass converted into energy with equation

Reply 1649

BrokenS0ulz

Original post by Elcor

I got 1.8x10^-3 amps :/

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I got that

Reply 1650

fnatic NateDestiel

Original post by L'Evil Fish

Medical is gonna be such a bore.

okay then!

:lol:

Reply 1651

jcwh97

Original post by L'Evil Fish

I said neutron to proton

So decrease in mass

Mass converted into energy with equation

I pretty much said that although I had little confidence with it. I probably should have stated that it was becoming a proton though.

Reply 1652

Elcor

Original post by L'Evil Fish

I said neutron to proton

So decrease in mass

Mass converted into energy with equation

Same, and I said some of the energy goes into KE of the electron and antineutrino

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Reply 1653

trooken

Original post by Elcor

I got 1.8x10^-3 amps :/

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I think I got that

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Reply 1654

gothmog827

for all those asking about a teachercol markscheme, while I cannot speak for him, for the g484 paper he released it on the same day at about 4pm. Obviously this paper will take longer so I'd guess you can expect the markscheme some time this evening or tomorrow

Reply 1655

gothmog827

Original post by trooken

I think I got that

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do you remember your method?

Reply 1656

L'Evil Fish

Original post by gothmog827

He's made a start on it, I'd say later this afternoon

Reply 1657

SH0405

Original post by L'Evil Fish

He's made a start on it, I'd say later this afternoon

How exciting...

Reply 1658

Elcor

I was sort of stumped by the first question: what did you guys say for the electric field? I said that it's a region in space where a charged particle experiences an electrostatic force.