Igcse Model Questions Vol1 2021 Physics Question 10

Practice objective / multiple choice question 10 from the 2021 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2021 Physics Objective / Multiple Choice Hard Difficulty
Question 10 IGCSE_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A sample contains \(2.0\times10^{6}\) atoms of a radioactive isotope X. Each decay emits a beta particle with kinetic energy \(0.5\ \text{MeV}\). The half‑life of X is \(30\ \text{min}\).\n(a) Calculate the activity of the sample at the start (in becquerels).\n(b) Determine the total energy released as radiation during the first hour (in joules).\n(c) If the sample is placed \(0.5\ \text{m}\) from a detector that records 1% of the emitted beta particles, estimate the count rate recorded after \(45\ \text{min}\).

Answer Options

A. a) 385 Bq; b) 6.0×10⁻⁸ J; c) ≈1.3 counts s⁻¹
B. a) 770 Bq; b) 1.20×10⁻⁶ J; c) ≈0.27 counts s⁻¹
C. a) 1.5×10³ Bq; b) 2.4×10⁻⁷ J; c) ≈5.4 counts s⁻¹
Correct Answer D. a) 770 Bq; b) 1.20×10⁻⁷ J; c) ≈2.7 counts s⁻¹
Correct Answer
D
Correct Option:
a) 770 Bq; b) 1.20×10⁻⁷ J; c) ≈2.7 counts s⁻¹

About This Question

This is Igcse Model Questions Vol1 2021 Physics Question 10. It is one of the objective questions from the 2021 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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