Post by: [Spy] on June 08, 2010, 03:21:53 pm
can someone pleaseee explain phase difference fully, i never seem to understand it properly, and please do question 5 (a), Nov 07
thanks :)
Post by: nid404 on June 08, 2010, 03:33:18 pm
Sorry for that crappy drawing attached
Anyway this should give you an idea
(http://4.bp.blogspot.com/_vbLcDpetdkY/SYUOq0sdO-I/AAAAAAAAAHI/8vUnINuy6yg/s320/fig+3.png)
Post by: [Spy] on June 08, 2010, 03:39:16 pm
and im sorry, i dont really understand you got what you drew. i mean do you make each pie revolution, into a third?
Post by: nid404 on June 08, 2010, 04:06:08 pm
half the wavelength= pi radians
pi radians=180 degrees
so 60 degrees is pi/3
Post by: [Spy] on June 08, 2010, 04:23:14 pm
Post by: nid404 on June 08, 2010, 05:10:05 pm
Wait I'll look for something
Post by: nid404 on June 08, 2010, 05:19:05 pm
Difference between two corresponding points of the wave should be one block in the graph....that's because 3 blocks=half a wavelength and half the wavelength = 180 degrees.
I hope this helps :-\
Post by: [Spy] on June 08, 2010, 05:25:45 pm
i'm sorry, but this is buggingggg me :/
its okay if you dont wanna reply, someone else will hopefully :)
Post by: nid404 on June 08, 2010, 05:34:18 pm
I think Amr will be able to explain better. He's the one or physics. I'm not too good :(
Post by: [Spy] on June 08, 2010, 05:43:42 pm
can you explain the Intensity & amplitude part of it? or shall we just leave it for amr? :P haha cause my exam is tomorrow.
Post by: nid404 on June 08, 2010, 05:46:02 pm
I=ka2
Post by: coco pops on June 08, 2010, 05:47:13 pm
Spacing:_______________________
Ordering:_______________________
Motion:________________________
a) N (mas no. 17 proton no, 7) + He(mas no.4 proton no.2) ----> O <mass 17 proton 8> + ______
i) complete equation
ii) idenify particle other than oxygen nucleus produced in the transformation
is the answer for this Hydrogen molecule? or wt
please reply quickly
thank you
Post by: Asamy111 on June 08, 2010, 06:00:25 pm
Post by: coco pops on June 08, 2010, 06:08:16 pm
is the drawing attached.. correct???
nop there is no drawing present..thts the only thing given in the question
Post by: Chingoo on June 08, 2010, 06:25:05 pm
Spacing: The intermolecular spacing between liquid and ice are almost the same. In ice, molecules are present at fixed positions in the crystal lattice, leaving large empty spaces between them, much like the length of spaces between molecules in liquid state.
Ordering: In ice, there is short-range order and molecules are present at fixed positions in the crystal lattice. In water, there is long-range order and molecules are randomly arranged in short-range.
Motion: Ice molecules exhibit vibratory motion, oscillating about their mean position while as liquid, water molecules exhibit translatory motion. Average Ek of molecules is directly proportional to temperature for both states.
These are short-hand answers; do give some expression to them to score 6 marks
a) N (mas no. 14 proton no, 7) + He(mas no.4 proton no.2) ----> O <mass 17 proton 8> + X <mass 1 proton 1>
i) complete equation
ii) idenify particle other than oxygen nucleus produced in the transformation
Hydrogen
Post by: coco pops on June 08, 2010, 06:32:13 pm
and thank you for the answers! :D
sory 2 bother but could you please list me the proper detailed answers? if its nw a problem..thank you once again!
Post by: Asamy111 on June 08, 2010, 06:33:32 pm
and i meant the drawing attached for the graph question by Xera . is it right or wt??
Post by: sammwangi on June 08, 2010, 06:35:09 pm
1)compare the spacing,ordering and motion of molecules in ice at 0 degrees celcius and water also a 0 degree celcius (6 marks)
Spacing:_______________________
Ordering:_______________________
Motion:________________________
a) N (mas no. 17 proton no, 7) + He(mas no.4 proton no.2) ----> O <mass 17 proton 8> + ______
i) complete equation
ii) idenify particle other than oxygen nucleus produced in the transformation
is the answer for this Hydrogen molecule? or wt
please reply quickly
thank you
The Spacing is smaller
The ordering is random(er)
The motion the particles move further apart (i.e now include translation as opposed to only vibration)with the same average kinetic energy i.e speed as before.
Water exhibits a weird solid state due to the presence of hydrogen bonding. Essentially, the ice structure is less dense than water because the molecules are further apart(thats why ice floats on water). The hydrogen bond spread the water molecules out in solid state. The implication of this that the spacing is further apart in solid state and the molecule is more ordered i.e. ice is crystalline while water is amorphous.... the motion is that the water particle move further apart bt with the same average kinetic energy i.e speed as before because the temperature is the same.
Post by: halosh92 on June 08, 2010, 06:43:02 pm
ya sry N has mas no. of 14 not 17.my bad
and thank you for the answers! :D
sory 2 bother but could you please list me the proper detailed answers? if its nw a problem..thank you once again!
where did u get this question from? is it form a pastpaper?
Post by: Chingoo on June 08, 2010, 06:47:34 pm
Yes, these questions are from past-papers Halosh. I believe the second question is more recent.
Post by: halosh92 on June 08, 2010, 06:55:04 pm
and one more question in springs
in series and parallel springs how to find combines extension and combined spring constants
VERY URGENT PLZ
Post by: halosh92 on June 08, 2010, 07:46:13 pm
someone plz explain wats short ranged order and long ranged order.
and one more question in springs
in series and parallel springs how to find combines extension and combined spring constants
VERY URGENT PLZ
anyone??:S
Post by: aorta on June 08, 2010, 09:14:57 pm
anyone??:S
Just like in resistors. i.e. If in parallel the you say (extension x extension)/ (extension+ extension)
And in series, just add.
Post by: halosh92 on June 08, 2010, 09:19:03 pm
Just like in resistors. i.e. If in parallel the you say (extension x extension)/ (extension+ extension)
And in series, just add.
ok wat about the spring constant?
Post by: aorta on June 08, 2010, 09:42:48 pm
ok wat about the spring constant?
Use the formula l=ke
lets say our e is 2/3e
Then, k would be 3/2e
Just make k the subject and you'll get it