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Physics, Chemistry and Biology: Post your doubts here!

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How to solve Q 2 (c) (ii) of 0610/62/O/N/10 ?? This question is getting my nerves !!! We are asked to calculate the actual length of the shell but the magnification isn't given. My Name
 
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Hello Everyone.
My question is regarding Chemistry, I have passed earlier to a question found in Paper 11 O/N 2011 Question 11. The Idea there had stated that Sodium was the metal that CANNOT be used in electroplating by using an Aqueous solution.Why is it sodium? Why couldn't it be Silver? Is it because it would react or it has a more reactivity in the reactivity series.

Just wanted to double check
Thanks you in advance,
 
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Hello Everyone
My question is about physics
paper: 0625/61/O/N/12
Question: 1 (c)
In part (b) I got 210 (which is correct) and when I tried to use it in the equation mentioned in part (c) I got the answers:
11, 19, 31, 39, 50
while the correct answers are:
1, 9, 21, 29, 40

Thanks :D
 
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I AM PROBLEMS WITH THERMAL PHYSICS SO CAN ANYONE TELL ME ABOUT SOME GOOD VIDEOS AND WEBSITES THNX
 
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