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Physics: Post your doubts here!

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Can someone please explain why the answer to q37 of p1 mj2007 is C? I would really appreciate it if someone replies before Thursday as I have to appear for an exam on Thursday!
 
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I think it would be helpful if you read the attached files once. you can skip the half-life part
few things not included are,
The rate of decay is proportional to number of particles present

dN/dt ∝ N

dN/dt = -λN

part (b) asks for probality of rate of decay

part (c)(i) asks for the inittial activity and it can easily be found by the formula
part (c)(ii)
If A = λN

Then, A0 = λN0
find N0
then using
N0/NA =M/Mr

Where NA = Avogadro’s constant

Find M
 

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upload_2014-4-9_14-32-56.png
For a single discharge , whats the average potential difference ?
it should be 1.6 , but the answer is 3.2
 
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