Physics, Chemistry and Biology: Post your doubts here!

[za Shadow]

thnx a million it helped thnx again

np annnnnyyytime

 

[za Shadow]

what is ammoniafication

 

[sma786]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_31.pdf

Question 11 (b) its of 4 marks n i dunno how to do it at all =[ .. HELP

 

[kainat husain]

is there any difference between INDEX OF REFRACTION and REFRACTIVE INDEX?

 

[sma786]

is there any difference between INDEX OF REFRACTION and REFRACTIVE INDEX?

nopee ..

 

[Dashing Cancerian]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s11_qp_31.pdf

Question 11 (b) its of 4 marks n i dunno how to do it at all =[ .. HELP

(b) (i) it would be in liquid state as now the temp increase after the state has changed....(remember the heating curve)
(ii)move around more rapidly / faster / more KE move further apart / spreads out (NOT molecules expand). As the state is liquid on providing heat to it it will gain energy and the temp will rise resulting in a change to gaseous state....

 

[kainat husain]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s04_qp_3.pdf
Q7- How do we know which are compressiona and rarefactions? as the line consist same kind of '-' :/
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w04_qp_3.pdf
q-4 a (i)
q-9 a (ii)

 

[kainat husain]

nopee ..

but in my book INDEX OF REFRACTION= sin i/sin r
but in marking scheme REFRACTIVE INDEX= speed in air/speed in glass

 

[EpicLol]

but in my book INDEX OF REFRACTION= sin i/sin r
but in marking scheme REFRACTIVE INDEX= speed in air/speed in glass

They are both correct, n(Index of refraction) = speed in air/speed in medium
but later on some scientist (forgot the name) decided that calculating speed was too hard, therefore the angles of incident and refraction were enough to calulate the index of refraction.

I think they are derived from the forumula
n1*SinQ1 = n2*SinQ2

 

[sumangupta]

finally...d toughest part of bio....DONE..!!!

 

[sumangupta]

now...CHEMISTRY...!!!

 

[aliiiiiiiiii]

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_s04_qp_3.pdf
Q7- How do we know which are compressiona and rarefactions? as the line consist same kind of '-' :/
http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Physics (0625)/0625_w04_qp_3.pdf
q-4 a (i)
q-9 a (ii)

q-4-a-i put hot side of the metal wire in beaker then read the temp always put the hot side in the thing u want to measure
q-9-a-ii do 240/6 u will get the number of turns =40:1

 

[za Shadow]

finally...d toughest part of bio....DONE..!!!

how was it??

 

[Moataz shazly]

Hi
Can someone tell me the definitions of the menustral cycle hormones?
I mean what does each hormone do specifically please.
Thanks in advance
Note I am doing paper3 bio today

 

[noohx]

now...CHEMISTRY...!!!

What question/topics came?

 

[sumangupta]

how was it??

really good...urs?

 

[sumangupta]

What question/topics came?

in bio?

 

[noohx]

in bio?

Yeah.

 

[always-smile :)]

hey guys did anybody of u forget his/her statement of entry before
i forgot it and nw i'm 3 hours away from my house

 

[IGSCE.Geek.]

hey guys did anybody of u forget his/her statement of entry before
i forgot it and nw i'm 3 hours away from my house

man feel sorry for yeah bro!