Igcse Model Questions Vol1 2017 Physics Question 10

Practice objective / multiple choice question 10 from the 2017 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2017 Physics Objective / Multiple Choice Hard Difficulty
Question 10 IGCSE_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

A radioactive isotope has a half‑life of \(8.0\) days. A sample initially has an activity of \(5.0\times10^{5}\ \text{Bq}\). After \(20\) days, the power emitted by the sample is measured to be \(7.1\times10^{-8}\ \text{W}\). Assuming each decay releases the same amount of energy, (i) calculate the decay constant \(\lambda\) in \(\text{s}^{-1}\), (ii) determine the activity after \(20\) days, and (iii) find the energy released per decay in MeV. Give \(\lambda\) to two significant figures, the activity to two significant figures, and the energy per decay to one decimal place.

Answer Options

A. λ = 9.2×10^{-7} s^{-1}; A = 7.5×10^4 Bq; E = 4.2 MeV
B. λ = 1.2×10^{-6} s^{-1}; A = 9.5×10^4 Bq; E = 5.8 MeV
C. λ = 8.5×10^{-7} s^{-1}; A = 6.3×10^4 Bq; E = 6.3 MeV
Correct Answer D. λ = 1.0×10^{-6} s^{-1}; A = 8.8×10^4 Bq; E = 5.0 MeV
Correct Answer
D
Correct Option:
λ = 1.0×10^{-6} s^{-1}; A = 8.8×10^4 Bq; E = 5.0 MeV

About This Question

This is Igcse Model Questions Vol1 2017 Physics Question 10. It is one of the objective questions from the 2017 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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