What would you..

[naved_s9994]

...write for the following in the exam.
in dot point form. Im struggling to convert my " essays "
into dot points! 

Why Youngs experiment supports the wave model.
Why electrons/x-rays exhibit same properties.
Particle/wave duality of electrons, and why only particular energy levels are associated with the shells.
I end up writing 7 - 8 lines for a 2 or 3 mark question, which is completely unnessary!

Thanks in advance.
Really appreciate, any help!

[bem9]

youngs experiment shows destructive and constructive interference of light which produces bright and dark bands.
Interference is a wave phenomena and not a particle one, so it supports the wave model.

when X rays pass through the crystal, the ratio of w/wavelength is about one so diffraction occurs. Since the electron has a wavelength it too diffracts due to the small spacings and so exhibits similar properties to X rays

i have trouble with the last one too :S

[krzysiek]

With the last dot point, I struggle also but I know you can bring in lambda = h/mv, (sorry if the formula is wrong, I am only about to start studying) and in this sense, it shows the wave nature of electrons (because you can calculate their wavelength, thus a wave).

The particle aspect I would need to think about!

[IntoTheNewWorld]

dw, don't think about it, just copy straight from TT's cheat sheet.

"If electrons have a wavelength, then the wavelength could be imagined to form a closed loop around the nucleus, as a standing wave, this would mean that only specific wavelengths and their associated energies would be allowed"

[naved_s9994]

Particle/wave duality of electrons, and why only particular energy levels are associated with the shells.
I end up writing 7 - 8 lines for a 2 or 3 mark question, which is completely unnessary!

Electrons travel as a wave in their orbit around their nucleus, lambda = h/p
The electron wave can only exist if the wave intereferes with itself constructively. This is when the orbit is a discrete number of wavelengths.
Electrons must, therefore have the specific energy to give the correct wavelength to occupy an energy level

[krzysiek]

Copying directly from cheat sheet (without understanding the specific question being asked) will lose you marks.

[NE2000]

Copying directly from cheat sheet (without understanding the specific question being asked) will lose you marks.

It's not recommended obviously. And you would be better of looking at your cheat sheet while answering the question directly. But I think marks are only taken off if you contradict yourself in your extra information or you completely leave the scope of the question (eg. it asks for commutator role in generator and you start talking about the motor).

[naved_s9994]

Copying directly from cheat sheet (without understanding the specific question being asked) will lose you marks.

It's not recommended obviously. And you would be better of looking at your cheat sheet while answering the question directly. But I think marks are only taken off if you contradict yourself in your extra information or you completely leave the scope of the question (eg. it asks for commutator role in generator and you start talking about the motor).

Its just on there my personal reference. But ofcourse, I understand what you mean.

[krzysiek]

Oh, don't get me wrong - I have ALL of the definitions on my cheat sheet (what If my mind went blank?) but what I was recommending against was merely copying word for word right off your cheat sheet, because as NE2000 said, look at it and answer the question exactly using the definition you have in front of you to help you - rather than not thinking about it at all and copying it down.

[naved_s9994]

Oh, don't get me wrong - I have ALL of the definitions on my cheat sheet (what If my mind went blank?) but what I was recommending against was merely copying word for word right off your cheat sheet, because as NE2000 said, look at it and answer the question exactly using the definition you have in front of you to help you - rather than not thinking about it at all and copying it down.

Yea, thats what Ive been doing.
Thanks for the advice though

[dav132]

naved, aren't you meant to be at school...?

[naved_s9994]

naved, aren't you meant to be at school...?

Na, because Yr 11 Exams are happening, so im at home and only go to school for the exam.
Hey wait is te dave lawrence? ~~~!!!!!#@!~

[dav132]

yup

so are you doing physics again next year,
or are you gonna wait to see what you get?
what are you aiming for??
also how did you find methods?
...i might get in trouble for overtaking this thread lol

[naved_s9994]

so are you doing physics again next year,
or are you gonna wait to see what you get?
what are you aiming for??
also how did you find methods?
...i might get in trouble for overtaking this thread lol

Lol!
For methods Exam 1 38/40 According to TrueTears's solutions.
                 Exam 2 its hovering around 68-72 /80 accoridng to Truetears's solutions again.

Yea, ill wait till results. 

[dav132]

cool, good luck!