Joe S.

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Degree: Physics (Bachelors) - Bristol University

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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

Joe

Subjects offered

SubjectLevelMy prices
Maths A Level £20 /hr
Physics A Level £20 /hr
Maths GCSE £18 /hr
Physics GCSE £18 /hr

Qualifications

PhysicsA-LevelA*
MathematicsA-LevelA
Further MathematicsA-LevelA
 CRB/DBS Standard No CRB/DBS Enhanced No

How do I find the half-life of radioactive isotope?

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 equatio...

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 Nis 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 Nyou may find λ and follow the previous steps.

*Make sure you familiar with exponentials and logs before attempting this topic

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2 years ago

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