Physics (P2) Doubts.

[[Spy]]

hello guys

can someone pleaseee explain phase difference fully, i never seem to understand it properly, and please do question 5 (a), Nov 07

thanks

[nid404]

Phase difference is the difference between corresponding points of two waves measured in terms of

Sorry for that crappy drawing attached

Anyway this should give you an idea

[[Spy]]

the said the intensity is halved now, so the amplitude has to change?

and im sorry, i dont really understand you got what you drew. i mean do you make each pie revolution, into a third?

[nid404]

I didn't notice the amplitude...sorry

half the wavelength= pi radians

pi radians=180 degrees

so 60 degrees is pi/3

[[Spy]]

yeah okay i understand that party, but i mean how did you draw it exactly? godd i hate wavess!!!

[nid404]

Still don't understand?

Wait I'll look for something

[nid404]

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 

[[Spy]]

okay yes i get it but i mean you do 1/3 * WHAT? i mean you just visually draw almost a third of half the wavelength? and from what points?

i'm sorry, but this is buggingggg me :/

its okay if you dont wanna reply, someone else will hopefully

[nid404]

The difference between the 2 crests/troughs would be 1/3rd of 180

I think Amr will be able to explain better. He's the one or physics. I'm not too good 

[[Spy]]

yeah i think i get it
can you explain the Intensity & amplitude part of it? or shall we just leave it for amr? haha cause my exam is tomorrow.

[nid404]

I is directly proportional to square of the amplitude

I=ka²

[coco pops]

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

[Asamy111]

is the drawing attached.. correct???

[coco pops]

is the drawing attached.. correct???

nop there is no drawing present..thts the only thing given in the question

[Chingoo]

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: 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