Hi, my name is Joe Spilman I'm currently in my first year at the University of Bristol studying physics and I'm looking to tutor maths and physics, GCSE and A-level. I have come straight from sixth form where I studied A-levels in:
Physics A* - AQA
Maths A - "
Further Maths A - "
If you're currently studying for your A-levels or GCSEs then it wasn't that long ago that I was in your position, I can imagine what a help some hindsight and first-hand experience would have been at the time. So if your looking to deepen your understanding of certain topics or just looking for some extra exam prep then drop me a message.
Looking forward to hearing from you
|Maths||A Level||£20 /hr|
|Physics||A Level||£20 /hr|
The half-life of a radioactive isotope is the time taken for half of the atoms in a given sample of the isotope to decay. Radioactivity is random and so, half-life is the average time taken for a large number of atoms.
There are two ways to find the half-life, both come from the decay equation: N = N0e^(-λt) which is an exponential relationship*.
Where N is the number of atoms of the isotope left at time t and N0 is the number of atoms when t =0. λ is known as the decay constant and is the probability that an atom will decay per unit time. If you are given the decay constant you may find the half-life T1/2 by setting N = N0/2 and rearranging to find t = T1/2. Or if you are given N and N0 you may find λ and follow the previous steps.
*Make sure you familiar with exponentials and logs before attempting this topicsee more