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Search results
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Physics: Post your doubts here!
Q37 - its not D as no current will pass if both switch are open. Then its not even A as both are closed so current will be I. In B S2 is open and S1 is closed so current just flows in series so current is still I. In C current flows through parallel circuit as S1 is open and S2 closed and... -
Physics: Post your doubts here!
Q30- d sin theta=n lambda sin theta=1 as its normal to the grating. then d=1/N. N=300 per mm means 300000 per m. so 1/300000=(690*10^-9)*n n will be around 4. then multiply by 2 and u get 9 :D -
A level Biology: Post your doubts here!
May 2012 52 .. 2b)ii) is 400% in the mark scheme! but im getting 300% :/ -
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Chemistry: Post your doubts here!
well main thing is the signs. If the reactants turn to products or vice versa always change the sign! and take your time and write down all steps so you dont confuse urself :) good luck! -
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Chemistry: Post your doubts here!
okay the only way i get D is by substituting X with the no. of moles of R from the equations. Then find total moles. The equation which has same no. of moles is the right 1 and i got D that way :P -
A level Biology: Post your doubts here!
we always take 0.05 in chi square and t-test. in the text book it was written about 0.05 being scientifically proved or something. so just always use 0.05 value :) -
A level Biology: Post your doubts here!
hmm i dont get it either! it was more simple in the mark scheme! -
Chemistry: Post your doubts here!
if u still dont get it just let me know :) -
Chemistry: Post your doubts here!
283+44-286=+41! and im not a bro im a sis!! guess i should change my pic XD -
Chemistry: Post your doubts here!
ugh this was my exam! i wasnt able to get it that time :/ is it C anyway? -
A level Biology: Post your doubts here!
yeah they didnt specify but i dont think it really mattered as we could solve without knowing :) for b u just have to give reasons why its reliable. many measurements were taken etc. however the brush border of columnar cells werent measured so that would make it unreliable -
Chemistry: Post your doubts here!
lol i prefer sis not bro ;) umm yeah i answered that above :) -
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A level Biology: Post your doubts here!
you dont need that info to solve part b :) -
Chemistry: Post your doubts here!
Q of conc. Ca+2 is replaced with 2 H so the resulting solution is H2SO4. so H2SO4 + 2KOH--> K2SO4+2H2O find moles of KOH. then divide by 2. this gives moles of H2SO4. its equal to moles of CaSO4. then moles=volume*concentration so divide the moles by 50/1000 and u get A :) -
Chemistry: Post your doubts here!
Answer is B because more energy is needed when the electron is removed from next orbital. In all options there are 2 p electrons. But in B theres only 1 so the next electron is removed from next orbital so more energy is needed :)