Decay constant from half-life
A source in a photoelectric sensor trial has half-life \(4\,\text{h}\). Calculate decay constant in units of \(10^{-5}\,\text{s}^{-1}\). 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.