Gce Model Questions Vol1 2019 Physics Question 12

Practice objective / multiple choice question 12 from the 2019 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty

Question 12 GCE_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

An isotope A (atomic mass \(60\ \text{u}\)) decays by \(\beta^{-}\) emission with a half‑life of \(30\ \text{min}\). Each decay releases on average \(0.5\ \text{MeV}\) of kinetic energy (beta particle plus antineutrino). A detector records a total released energy of \(1.2\times10^{6}\ \text{J}\) over a period of \(2\ \text{h}\). Assuming all decays occur within the sample, determine the initial mass of isotope A present at the start of the measurement.

Answer Options

A. 2.0×10⁻⁶ kg (≈2.0 mg)

B. 1.8×10⁻⁶ kg (≈1.8 mg)

C. 1.2×10⁻⁶ kg (≈1.2 mg)

Correct Answer D. 1.6×10⁻⁶ kg (≈1.6 mg)

Correct Answer

Correct Option:

1.6×10⁻⁶ kg (≈1.6 mg)

About This Question

This is Gce Model Questions Vol1 2019 Physics Question 12. It is one of the objective questions from the 2019 Gce Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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