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Exam 2 Answer Thread
« Reply #60 on: November 14, 2007, 03:34:32 pm »
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i wrote broad spectrum instead of continuous ><

i thought they were one and the same??????

rox-n-bones

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Exam 2 Answer Thread
« Reply #61 on: November 14, 2007, 03:53:58 pm »
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Quote
i got 9580 ms or something for the speed  :?


i got something like that as well? i made soo many stupid mistakes it's not funny oh well. TODAY WAS MY LAST EXAM WOOOHOOO

Galelleo

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Exam 2 Answer Thread
« Reply #62 on: November 14, 2007, 04:24:45 pm »
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Quote from: "abcat"
Quote from: "Galelleo"

Quote from: "Ahmad"
For hydrogen question:

* Hydrogen is in space between Sun and Earth.
* As light passes through them some wavelengths corresponding to difference in energy levels are absorbed.
* Hence the other wavelengths are passed through.
* Note resemblance between emission spectrum of hydrogen and absorption.

Something on the lines of that, I wrote more.. but can't remember.


I said... "We can see from hte hydrogen emission spectra that hydrogen atoms have energy elvels at (the given wavelengths) ... the suns absorption spectra shows gaps in the same wavelength, so we cna safely assume that the photons of that energy are absorbed by the hydrogen on/around the sun.


I wrote something very similar, but I didn't actually understand/believe it. It seemed the logical answer but I can't really get my head around it

If photons with that energy were absorbed by the Hydrogen, why did they show up as bright spots on the Hydrogen emission spectra?

The mercury vapour questions threw me a fair bit, I think I wrote that they give off mainly in the Ultra-Violet range. As for how the light is created I think I just took a wild stab heheh.


the hydrogen emission spectra was only there to show us that hydrogen absorbs those frequencies.

Initially, theyre absorbed by the hydrogen. which means the abrosption spectra from the sun has gaps tehre... then (later on, not relevant to example) the energy in that hydrogen atmo would have igven off the same photos. which is why the hydrogen emission spectra had them as colours.
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Galelleo

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Exam 2 Answer Thread
« Reply #63 on: November 14, 2007, 04:26:01 pm »
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continuous isnt hte same as broad... broad isnt definite, it just suggests that theres a larger spectra... (rather than all frequencies of light) ... i think :S

but yeh, you were suppsoed to say that light bulb gives a continuous spectrum, and vapour lamp gives a discrete spectrum... thats the question i lost marks on :( :( :(

after that the principles were thermal motion of electrons and photon emission (respectively).
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melodrama

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Exam 2 Answer Thread
« Reply #64 on: November 14, 2007, 04:50:20 pm »
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OMG that was the word!!!! i was trying to think of the word opposite to continuous (discrete) but i gave up and called it a "specific and unique emission spectra) LOL.

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Exam 2 Answer Thread
« Reply #65 on: November 14, 2007, 05:02:28 pm »
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jack would be disappointed, he spent 2 lessons on discrete and continuous!!  :P

Collin Li

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Exam 2 Answer Thread
« Reply #66 on: November 14, 2007, 05:02:31 pm »
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Quote from: "Spirited Sloth"
OMG that was the word!!!! i was trying to think of the word opposite to continuous (discrete) but i gave up and called it a "specific and unique emission spectra) LOL.


AHAHAHAHA. I'm bagging you about that for the rest of your life, and I'm telling DW.

Galelleo

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« Reply #67 on: November 14, 2007, 05:35:52 pm »
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lol , i had a complete brain fart on that question... didnt know the answer.

I said something like ... incoherent spectrum and emission spectrum.
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Exam 2 Answer Thread
« Reply #68 on: November 14, 2007, 05:42:58 pm »
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Blah
I did what I usually do and made some stupid mistakes
Looks like no study score of 40 for me...
>_<

Lolz, for the question with the hydrogen spectra and the dark bands, I couldn't answer it (I really had no idea what that question was talking about :P), and wrote "It gets absorbed" as an afterthought (just as they said "Pens down"). Is it possible that I could still get a mark for that?  :lol:


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

2.5 A, 10 V, 2 V

6 W, 5 W, 5 W

Yep, that's what I got to. You need to use the total resistance of 4Ω, not the resistance of a single wire (2Ω).

Quote
im pretty sure anywhere between 0.9 - 1.1 will be accepted..

i personally put 1.0

I put 1.0 as well.
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Galelleo

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Exam 2 Answer Thread
« Reply #69 on: November 14, 2007, 06:28:03 pm »
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lol i finished half an hour early

walked out around 1 and went for some lunch :P, no guilt lol.... even had time to check my answers... simple, straight forward questions...my favorite exam so far
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boulos90

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Exam 2 Answer Thread
« Reply #70 on: November 15, 2007, 12:35:32 pm »
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Itute solutions are upp!!

Damn for Question 2 electric power did we have to draw the magnetic field lines that wernt coming from the magnet?? coz i didnt:(