Neco Model Questions Vol1 2025 Physics Question 2
Practice objective / multiple choice question 2 from the 2025 Neco Model Questions Vol1 Physics examination.
A sample contains \(5.0\times10^{12}\) atoms of a radionuclide whose half‑life is \(8.0\ \text{h}\). Each decay emits a beta particle of kinetic energy \(0.5\ \text{MeV}\). After \(24\ \text{h}\) the sample is placed near a detector that records \(2.0\times10^{5}\) counts per minute. The detector efficiency is 25 % and every decay produces a detectable beta. (a) Determine the activity of the sample at the start of the \(24\ \text{h}\) period in becquerels (Bq). (b) Calculate the total energy released during the \(24\ \text{h}\) period in joules. Give your answers in scientific notation with two significant figures.
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This is Neco Model Questions Vol1 2025 Physics Question 2. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Physics examination.
Difficulty level: Hard .
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