phy ques ... serious help needed !!!! help me out!!!!!

[workinghard]

If any of u wr able 2 do da 10th ques of w10 43 and w10 41
Da OP amp ques
Kindly post da sol here
Cux I hv racked all ma brains n dese just keeps on boggling my mind
Thnks 2 any 1 who can solve ma dilemma!!!
If dere is a logic plx tell cux I no odewix I wont b able 2 do dem in ppr!!!!

 

[kakarocks]

It's easy for paper 43

(a) 1- infinite input impedance
2- infinite open loop gain
3- Zero output impedance

b (i) When the door is open the value of V on the inverting input is less as it has to go through the resistor r . When door is closed it goes directly and is greater than the noninverting input so the polarity changes

(ii) When door is closed the output is negative so connect the green led so that it works in this case [ it should be pointing towards the output wire] The red led should be the opposite of this

 

[kakarocks]

for paper 41[and 42 are same]

A - i- Z= pc Acousitc impedance = Density x speed in the medium

ii- use above formula to give 1707 as answer rounds off to 1700

b i- I = I transmitted + I Reflected

ii- put the values , get the answer

c if gel is used there is less reflection , if there is air alot of waves are reflected . While travellling into the body

 

[filza94]

FOR Chemistry PAPER 33!!!!!!!!!!

hydrated ammonim salt titrated with KMnO4
usual salt analysis
one thermal question

We have to titrate ammonium nitrate with KMn04 or would we need to oxidize potassium iodide in the presence of ammonium nitrate and then titrate the resulting solution with sodium thiosulphate? :|

see question no.1 in june2008-31
a similar question is expected!


FOR PHYSICS ASLEVEL PAPER 33

what we hav been practicing is the electricity one with beads in place of resistors.its very simple..and ya in the oscillation one we will be having a cylinder instead of a pendulam bob..

i doubt anything concerning magnets or diodes on A2 level will come for As practicals, hmm, they might just be giving diode as just another component of the circuit system, in past years there were things like that, but the procedure is still the same, you will just have to either measure current, volt etc. and draw the graph, and by the way it will be helpful to review the graphs for diodes. before going for exam.

YOU WILL NEED
1.retort stand.
2.bob/cylinder
3.stopwatch.
4.thread
5.multimeters
6.batteries
7.clamps.
8.resistors.
9.contacts

 

[WellWIshER]

haha dude check da mark scheme i did da same wt u did.....but da mark scheme tells something diffenernty

 

[sambridhi1]

p42 done people ?

 

[workinghard]

thanaks ...
it helped!!!!!!!!!!!!!!!!!!!!!!!!
but thnk god it didnt come
wat came ws worse... agreed or disagreed?!

 

[filza94]

for practicals learn frm here http://www.scribd.com/doc/6468212/Teach ... cal-Skills

 

[kakarocks]

The last question of applications was difficult rest was ok