Physics Unit 4 Exam discussion

[NE2000]

with the iron bar, i think everyone will get fulls marks either way. you cant lose marks for adding in detail

can you lose marks for not adding in detail though ...

[homghomg1]

lol I think the iron bar occupies pretty much the whole space inside the wires, so it'd be hard to draw the lines not going through it

No I think you are misinterpreting what I'm saying. I had my field lines starting at the north end and looping around going to the south pole. I didn't draw them going through the iron core.

ohh i see
hmm i don't know, i just did it as a normal electromagnet (through the bar)

[avram_grant]

you wont lose marks, it had a soft iron core

[almostatrap]

"magnetic field in the region around the iron bar" , it would be ridiculous if they EXPECTED lines through the bar from that

[Fireworks]

Damn, I've done not too well. What sort of mark will I need to get a B+?

[ayaz]

what do we think the cut off mark would be for an A+... but because i lost soooo many marks a A

[avram_grant]

prolly like 78 - 80/90

[catweazle]

Ok, i've marked my exam. What grade do you guys/girls think i will get for a 153/180

Given last years exams the grades were B+(132-147) A(148-161) A+(162-180)

[avram_grant]

Ok, i've marked my exam. What grade do you guys/girls think i will get for a 153/180

Given last years exams the grades were B+(132-147) A(148-161) A+(162-180)

A i think

[ayaz]

is th 78-80/90 for an A+?? or an A

[avram_grant]

is th 78-80/90 for an A+?? or an A

A+

[ayaz]

hey for the question it says determine the work fn and h i used the threshold freq (3E14)and then determined the h and W..
would this be correct???

[homghomg1]

Ok, i've marked my exam. What grade do you guys/girls think i will get for a 153/180

Given last years exams the grades were B+(132-147) A(148-161) A+(162-180)

I think you will get a mid to high A
I personally think the difficulty of this exam was higher than last year
if you look at the 08 examiner's report, you will see most marks are lost in explanation questions
Electric power Q10) question regarding application of lenz's law requiring an explanation, only 13% got 4 out of 4
Light Q1) simple question about how light globes produce light, only 22% got 2 out of 2
Light Q2) asks how light from globes differ from mercury lamps, only 41% got 2 out of 2
Light Q4) double slit question, asking why a bright band is formed in a certain spot on the screen, only 20% got 2 out of 2

There were some considerably harder explanation questions this year (a lot of people will lose marks on the two questions asking how young's experiment and the photoelectric effect support each model of light), so I'm thinking the A+ mark will be a little lower. Even if people say the owned the exam, that's the problem with explanation questions, you really don't know and you often don't do as well as you expect.

[Over9000]

not if you had TT cheat sheet Lol, just copy n paste

[TrueTears]

lol imagine the examiner marked consecutive papers that had the exact same sentences for the explain questions GG.