Physics GCSE
why activity falls
What why activity falls means in Physics GCSE, as defined for AQA.
Definition of why activity falls
Check what you remember
Read the wording for your board, then hide it and explain why activity falls in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: AQA
The number of decays per second is proportional to how many undecayed nuclei are left, so as the sample runs down the decays slow down and the curve gets shallower.
Topics that use why activity falls
Related terms
- background correction
- constant chance of decay
- fraction not number
- net decline as a ratio
- random decay
- steepest curve
- dice model
- halving chains
Using why activity falls in the exam
Check the command word and mark scheme for your exact question. After comparing your explanation with the reference, use the term in an answer on the linked topic. This practice does not predict an exam mark.
Practise Physics questions
Create a free account to answer exam-style questions on this topic and get feedback on your answers.
Start free
All Physics GCSE termsA week of Premium from your first lesson · Then the free plan continues · No card, no charge