VCE Stuff > VCE Physics
Exam 2 Answer Thread
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i wrote broad spectrum instead of continuous ><
i thought they were one and the same??????
rox-n-bones:
--- Quote ---i got 9580 ms or something for the speed :?
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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:
--- 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.
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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.
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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.
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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.
Galelleo:
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).
melodrama:
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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