Activity from decay constant
A radioisotope sample in a radioisotope decay log has \(1420\) undecayed nuclei and decay constant \(0.08\,\text{s}^{-1}\). Calculate activity. Use the diagram labels before calculating the requested value. Enter the numerical result and choose the interpretation that matches the quantum or nuclear physics.
Worked practice: physics data and result
Read the physical quantities first, then calculate the result and state what it means.
Write a full answer
Now write the response in full, in your own words — this is what the exam asks for. The AI marks it on the same moves you built above (focus, evidence, technique, judgement) and gives feedback on reasoning, evidence, and expression.