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Biology; Chemistry; Physics: Post your doubts here!

ashiqbal

ashiqbal

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lisahamed said:
hey guys.... could any of you help me out.... its physics O/N/02 paper 2 question 4...... i'm quite not sure how to draw (a) .... any help would be appreciated :) kinda panicking at this point..... the question paper link is http://www.xtremepapers.com/papers/CIE/Cambridge International O Level/Physics (5054)/5054_w09_qp_2.pdf
thanx in advance :)
Click to expand...
two rays, starting from M, diverging a little, striking the mirror, then reflected till P. the two rays start from same point, M , but end at two different points at P. then continue the two rays from P back INTO the mirror until they both meet
 
convent2012

convent2012

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i want help in :
A glass block of length 18cm and refractive index 1.5 contains a small air bubble . viewed from one side , the bubble appears to be 8 cm from this side. how far in the block will it appear when viewed from the opposite side??
a 4cm
b 6cm
c 10cm
d 12cm
 
bogus

bogus

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étudiante said:
i know :p dats only for leaves ;)




i was thinking the same as ashiqbal.... n m not sure but i think that the Cl should dissolve in the water present and form hypochorous acid (n thus give an acidic color on the UI)
confirm please :D[/quote
convent2012 said:
i want help in :
A glass block of length 18cm and refractive index 1.5 contains a small air bubble . viewed from one side , the bubble appears to be 8 cm from this side. how far in the block will it appear when viewed from the opposite side??
a 4cm
b 6cm
c 10cm
d 12cm
Click to expand...
10 i guess.... i dont think the refractive index is of any use here
Click to expand...
 
bogus

bogus

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attached is the paper and here is an answer i googled:
Students should be able to notice bubbles of gas at each electrode. At the positive electrode, the indicator turns red initially, and is then bleached to colourless. This indicates the presence of chlorine. At the negative electrode the indicator turns purple. The remainder of the solution stays green.
 

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étudiante

étudiante

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bogus said:
attached is the paper and here is an answer i googled:
Students should be able to notice bubbles of gas at each electrode. At the positive electrode, the indicator turns red initially, and is then bleached to colourless. This indicates the presence of chlorine. At the negative electrode the indicator turns purple. The remainder of the solution stays green.
Click to expand...
the indicator is being bleached by the electrode product... it is not turning colorless as an indication of any pH :) as chlorine gas is being produced at that electrode
thanx though...
 
nafis shahRiyar

nafis shahRiyar

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convent2012 said:
i want help in :
A glass block of length 18cm and refractive index 1.5 contains a small air bubble . viewed from one side , the bubble appears to be 8 cm from this side. how far in the block will it appear when viewed from the opposite side??
a 4cm
b 6cm
c 10cm
d 12cm
Click to expand...
Pretty uncommon question :p Is it from Q/P?? which year then?
 
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