Gce Model Questions Vol1 2020 Physics Question 2
Practice objective / multiple choice question 2 from the 2020 Gce Model Questions Vol1 Physics examination.
A sample contains \(2.00\ \text{g}\) of pure \(^{60}\mathrm{Co}\) whose half‑life is \(5.27\ \text{yr}\). After \(12\ \text{yr}\) the gamma‑ray intensity is measured. (a) Find the fraction of the original activity that remains after \(12\ \text{yr}\). (b) Express the intensity \(I\) after \(12\ \text{yr}\) as a fraction of the initial intensity \(I_{0}\). (c) The gamma rays are then passed through a lead shield of thickness \(x\) cm, where the attenuation follows \(I = I_{0}e^{-\mu x}\) with \(\mu = 0.12\ \text{cm}^{-1}\). Determine the thickness of lead required to reduce the intensity to \(10\%\) of the intensity after \(12\ \text{yr}\).
Answer Options
About This Question
This is Gce Model Questions Vol1 2020 Physics Question 2. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Physics examination.
Difficulty level: Hard .
Master the Exam!
You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.