Neco Model Questions Vol1 2019 Physics Question 2

Practice objective / multiple choice question 2 from the 2019 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2019 Physics Objective / Multiple Choice Hard Difficulty
Question 2 NECO_MODEL_QUESTIONS_VOL1 • 2019 • PHYSICS • objective

A mixed radioactive sample contains two beta‑emitting isotopes, A and B. Isotope A has a half‑life of 5 min and an initial activity of 8000 Bq. Isotope B has an unknown half‑life \(T_{B}\) and an initial activity of 2000 Bq. After 15 min the total measured activity is 2500 Bq. (a) Find the half‑life \(T_{B}\) of isotope B (in minutes, to two decimal places). (b) How many beta particles are emitted by isotope B during the first 30 min? Give your answer in scientific notation to three significant figures.

Answer Options

A. T_B = 30.00 min; emitted particles \approx 3.10×10⁶
B. T_B = 25.75 min; emitted particles \approx 4.00×10⁶
C. T_B = 45.20 min; emitted particles \approx 2.50×10⁶
Correct Answer D. T_B = 36.15 min; emitted particles ≈ 2.73×10⁶
Correct Answer
D
Correct Option:
T_B = 36.15 min; emitted particles ≈ 2.73×10⁶

About This Question

This is Neco Model Questions Vol1 2019 Physics Question 2. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

View More Neco Model Questions Vol1 2019 Physics Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support