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Author Topic: IGCSE PHYSICS  (Read 22151 times)

Offline holychalice

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Re: IGCSE PHYSICS
« Reply #150 on: November 08, 2009, 01:20:10 pm »
charge = current * time
charge = 0.4 * 20 = 8C
???
nd power = Itv = Charge * Voltage
« Last Edit: November 08, 2009, 01:25:07 pm by M.@.N.ß.i.R. »
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Offline Ghost Of Highbury

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Re: IGCSE PHYSICS
« Reply #151 on: November 08, 2009, 01:20:36 pm »
Quote from: ~~~~shreycool~~~~ on November 08, 2009, 01:17:26 pm
charge = power * tmie!!!

that is 0.6*20!!!

this time i read the question!!!

abbe oye, Q = I *t
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #152 on: November 08, 2009, 01:21:02 pm »
hey one last doubt???

will ticker tape question come in the paer!!!

i have seen one such question in 2008 winter !!
dude pls hel[p!!
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #153 on: November 08, 2009, 01:21:37 pm »
Quote from: A@di on November 08, 2009, 01:20:36 pm
abbe oye, Q = I *t
toh fir wat is power * time!!!??
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Offline moon

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Re: IGCSE PHYSICS
« Reply #154 on: November 08, 2009, 01:23:26 pm »
Quote from: A@di on November 08, 2009, 01:08:33 pm

R = V/I => 4/0.4 = 10 ohms

Why did we find the resistance by 4/0.4 instead of 1.5/0.4  ??? ??????
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #155 on: November 08, 2009, 01:25:01 pm »
oye yaa!!
didnt notice it!!
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Offline xXFaKeXx

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Re: IGCSE PHYSICS
« Reply #156 on: November 08, 2009, 01:28:19 pm »
Can som1 plz tell me wen 2 use sin r/sin i instead of sin i /sin r to calculate the refractive index?
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Offline Ghost Of Highbury

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Re: IGCSE PHYSICS
« Reply #157 on: November 08, 2009, 01:29:49 pm »
sin i / sin r if from optically less dense medium to optically more dense medium

sin r / sin i if from optically dense medium to less dense medium
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Offline xXFaKeXx

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Re: IGCSE PHYSICS
« Reply #158 on: November 08, 2009, 01:30:49 pm »
thanks a ton aadi!!
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #159 on: November 08, 2009, 01:32:35 pm »
dude aadi why did ya do 4/0.4 instead of 1.5/0.4???
they had asked resistance for lamp!!
u did for the whole thing!!
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Offline Ghost Of Highbury

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Re: IGCSE PHYSICS
« Reply #160 on: November 08, 2009, 01:34:20 pm »
i too did it that way, because resistance of lamp is asked. i saw the markscheme it says 4/0.4
i too think it shud be 1.5/.4

astar may help?
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Offline holychalice

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Re: IGCSE PHYSICS
« Reply #161 on: November 08, 2009, 01:34:43 pm »
i guess cuz 1.5 V is marked on d lamp its not supplied ...
4V is supplied to d circuit so 4 volts will be taken nd not 1.5
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Offline ~~~~shreyapril~~~~

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Re: IGCSE PHYSICS
« Reply #162 on: November 08, 2009, 01:36:03 pm »
mabir dont argue for the sake!!
they are telling to find resistance for lamp not the whole thing!!!

read the q carefully!!!
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Offline Ghost Of Highbury

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Re: IGCSE PHYSICS
« Reply #163 on: November 08, 2009, 01:37:08 pm »
the current flowing throught the circuit is same, so v can take 0.4A

but the voltage is different in series circuit, so it shudhere its only asked for the lamp, so it shud be 1.5/0.4
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Offline @d!_†oX!©

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Re: IGCSE PHYSICS
« Reply #164 on: November 08, 2009, 01:38:47 pm »
Quote from: xXFaKeXx on November 08, 2009, 01:28:19 pm
Can som1 plz tell me wen 2 use sin r/sin i instead of sin i /sin r to calculate the refractive index?
u know what it wuold be even better if u use the formula
n1sin1=n2sin2
instead of the above....cuz u will never go wrong wid this...
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