Physics Unit 4 Exam discussion

[TrueTears]

what was answer to Q4 on electric power

the one how you had to draw four lines each with an arrow indicating the direction of the magnetic field. Where were the arrows suppose to go and in what direction

Areas up from the electromagnet and going around and back into it at the bottom?

Yeah.

[ayaz]

how was the answer in light and matter Q4 496nm i got 331nm??

[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)

[/0]

I did it like this

[NE2000]

how was the answer in light and matter Q4 496nm i got 331nm??

Difference in path difference between two dark fringes is equal to the wavelength

[NE2000]

I did it like this

Did you use the big diagram space?

[ayaz]

i did pd=(n-.5)wavelegnth=496nm
do you think i could get a mark???

[tommyk221]

how was the answer in light and matter Q4 496nm i got 331nm??

Path Difference to point A is 5/2 x wavelength
Path Difference to point B is 3/2 x wavelength
Therefore the difference between path differences is one wavelength
The question said the difference between path differences was 496nm
So the wavelength is 496nm.

[homghomg1]

for the de broglie question, i said only orbits which have a circumference which is a whole number multiple of the electron's de broglie wavelength can exist, blah blah blah blah
and then i said, in orbits where standing waves are not be formed, destructive interference will occur, and the electron will spiral towards the nucleus and that wave will cease to exist[/u]
i am sure destructive interference will occur, it says so on 2007 itute trial paper solutions, but not so sure about electrons spiralling in, shit, why did i write that. can anyome confirm whether this is garbage or if it makes sense?


for the path difference question i solved 2 simultaneous equations and got 496 nm (i think similar to what /0 did)

[dylanru]

how was the answer in light and matter Q4 496nm i got 331nm??

Path Difference to point A is 5/2 x wavelength
Path Difference to point B is 3/2 x wavelength
Therefore the difference between path differences is one wavelength
The question said the difference between path differences was 496nm
So the wavelength is 496nm.

exactly what I did

[poojon]

anyone have a copy of the actual exam paper to upload?

[TrueTears]

I did it like this

Exactly the same here.

[kashmuq]

is anyone posting up a blank exam copy?

also with the magnet (q4), was it ok to draw lines going from top to bottom (i.e. like a normal bar magnet) without going through the bar?

[/0]

Did you use the big diagram space?

nah I didn't. 2 mark question bro

[NE2000]

is anyone posting up a blank exam copy?

also with the magnet (q4), was it ok to draw lines going from top to bottom (i.e. like a normal bar magnet) without going through the bar?

Yeah that's what I did. An electromagnet behaves like a permanent magnet... Anyone else (TT, /0 ?)