AQA Physics Unit 1 PHYA1 20th May 2013

Reply 1100

Gillerz

Original post by Seth James

I got that as well, did you do V/I=R then add 5000 to it and then do 90000-Ans

It's 30000 (5000/10000+X)*6=0.75

Reply 1101

Zozzy

2

I actually really liked this paper in the end but then again everybody seemed to, so I'm guessing the grade boundaries will probably be high. Do you think it will be around 50 for a B and 55 for an A?

Reply 1102

TheSnail

17

Original post by Mr.Suhk

You dont add internal resistance- it said what is the total resistance of the circuit; this refers to the resistors not the battery itself so it is irrelevant

I added the internal resistance, surely the battery is part of the circuit? :confused:

Reply 1103

Zakee

Original post by GeneralOJB

You had to add the internal resistance as well.

My problem was that I thought the resistance of the circuit meant the 'load resistance', not the 'internal resistance' of the battery'.

My bad, I guess I'd achieve one mark for showing that I worked out the resistance of the parallel combination?

Reply 1104

x-Sophie-x

13

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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Reply 1105

posthumus

20

Original post by g.k.galloway

I added the internal resistance, surely the battery is part of the circuit? :confused:

Fair point... but typically you don't :confused:

I thought it was a trick question anyway...

The battery supplies a certain amount of voltage to the circuit, so internal resistance already taken into consideration.

I'm not sure though... but that's how I thought of it

Reply 1106

Mr.Suhk

No i agree with you, the internal resistance should be irrelevant

Reply 1107

x-Sophie-x

13

Original post by g.k.galloway

I added the internal resistance, surely the battery is part of the circuit? :confused:

I added the internal resistance too :frown:

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Reply 1108

posthumus

20

Original post by x-Sophie-x

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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I wrote the exact same thing

Reply 1109

GeneralOJB

OP

Original post by g.k.galloway

I added the internal resistance, surely the battery is part of the circuit? :confused:

Yeah, so did I. If you don't include the internal resistance when calculating total resistance, it's the first I've heard of it.

Reply 1110

x-Sophie-x

13

Is the paper out of 70 or 72 btw?

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Reply 1111

medicus

How high will the grade boundaries be in your opinion?
54/55 for an A or higher?

Reply 1112

Goods

16

Original post by x-Sophie-x

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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w+ is charged/ it has rest mass

Reply 1113

BayHarborButcher

17

Original post by x-Sophie-x

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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Photon = infinite range, w = limited range but what you said is right too

Reply 1114

GeneralOJB

OP

Original post by x-Sophie-x

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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This was actually quite simple. I just said the W boson has mass but the photon doesn't. Alternatively you could have said the W boson is charged but the photon is not charged.

Reply 1115

TheSnail

17

Original post by x-Sophie-x

How was the photon and W+ boson different?

I said the photon is the exchange particle in electromagnetic interactions, and W+ was the exchange particle in weak interactions but I had no idea :s-smilie:

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I put the boson had a charge :confused:

Or is that wrong...aaahhh I don't know

Reply 1116

cyfer

13

Found the paper really easy so I'm guessing grade boundaries will be really high unfortunately.

Do you think 70 marks will be 120 UMS or will it be lower nonetheless, like 66+?

Reply 1117

Zakee

I didn't include the internal resistance, as I thought the resistance of the circuit meant the load resistance (i.e, the resistance of the external components).