Author Topic: Exam 2 Answer Thread (Read 6647 times) Tweet Share

maxleng · « **Reply #15 on:** November 14, 2007, 01:29:30 pm »

Quote from: "v2shan"

Quote from: "maxleng"
according to this Q (neap 2006)

a larger slit width has a larger pattern, and smaller width has a smaller pattern (note: spacing is still the same) which should give the answer C on our exam

sry, but the answer for that is wrong, i checked with my tutor a few weeks ago

n spirited i got the same cept for the 2nd light q, were u meant to get the h value from the graph as well, cos i just used the 6.63E-34..... ooh i think thats y it was 3 marks, was it 3marks?... oh n u have very good memory

what a load of SHIT ahhhhh fuck you NEAP

Ahmad · « **Reply #16 on:** November 14, 2007, 01:30:06 pm »

I'm gonna do the impossible and disagree with Mel for some of those power loss questions. :x

melodrama · « **Reply #17 on:** November 14, 2007, 01:30:39 pm »

were you supposed to?

___ · « **Reply #18 on:** November 14, 2007, 01:31:15 pm »

i used total resistance of 4ohms :?

everyone else i talked to after the exam did too

AhaShake · « **Reply #19 on:** November 14, 2007, 01:31:18 pm »

I am going to agree with Ahmad. You had to remember the resistance was 4 ohm not 2 ohm.
I got nervous there, without Ahmad questioning it on the first page. But good.

Matt89 · « **Reply #20 on:** November 14, 2007, 01:31:19 pm »

Quote from: "maxleng"

Quote from: "Matt89"
Quote from: "Spirited Sloth"
2.5 A, 11 V, 2.2 V, 6W, 5.5W, 5.5W

Totally f***ed that one up. I stuffed up the calculation of the power, so I lost 3 marks

woah i got diff answers...i think cos i used a resistance of 4 ohms SHIT!!!!

I used resistance of 4 ohms, but i accidentally used 2.5 A instead of 0.5 A

melodrama · « **Reply #21 on:** November 14, 2007, 01:31:59 pm »

what i did was find the frequency from the graph and i got 0.9eV... it'll be about +/- 0.1 depending on how you draw your graph i guess.

omg. ahmad disagrees with me. damn, -1934871394871 marks for me.

v2shan · « **Reply #22 on:** November 14, 2007, 01:32:14 pm »

i dunno w/e 2 marks to conservative, practical was all good but what bout theory, some tricky q's i reckon e.g. the hydrogen emission one

Ahmad · « **Reply #23 on:** November 14, 2007, 01:33:26 pm »

Yeah, so I got something like (can't remember very well):

2.5 A, 10 V, 2 V

6 W, 5 W, 5 W

boulos90 · « **Reply #24 on:** November 14, 2007, 01:33:43 pm »

2.5 A, 11 V, 2.2 V, 6W, 5.5W, 5.5W

i got 2.5A, 10V, 2.0V 6W, 5W, and 5W i think...

I took resistance in power lines to be 4ohms

hifer · « **Reply #25 on:** November 14, 2007, 01:33:53 pm »

Quote from: "Spirited Sloth"

but when you increase gap width, you increase w and thus ratio wavelength/w decreases and there's less diffraction, meaning that it'll bunch up... i dunno. i said C initially but i changed my mind.

Yup, it's definitely B for that one

melodrama · « **Reply #26 on:** November 14, 2007, 01:34:08 pm »

AH THAT'S NOT FAIR. NEAP HAD A SIMILAR QUESTION AND THEY USED 2.0 OHMS. FUCK YOU NEAP.

maxleng · « **Reply #27 on:** November 14, 2007, 01:34:11 pm »

i said sunlight is missing the energy of hydrogen since it uses it, hence when passed through a prism the spectrum of hydrogen will not be seen

i dont think its totally right tho :?

maxleng · « **Reply #28 on:** November 14, 2007, 01:34:39 pm »

Quote from: "Spirited Sloth"

AH THAT'S NOT FAIR. NEAP HAD A SIMILAR QUESTION AND THEY USED 2.0 OHMS. FUCK YOU NEAP.

LOL lets go burn down NEAP head quarters :twisted: :twisted: :twisted:

melodrama · « **Reply #29 on:** November 14, 2007, 01:34:56 pm »

k im gonna go chem now. mods, edit my answers if you like. unless... you contradict me ... LOL.

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