Neco Model Questions Vol1 2024 Physics Question 48

Practice objective / multiple choice question 48 from the 2024 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2024 Physics Objective / Multiple Choice Hard Difficulty
Question 48 NECO_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • objective

A 2.0 g sample of a radioactive isotope \(X\) (molar mass \(M=100\) g mol⁻¹) decays by β‑emission to a daughter isotope \(Y\) with half‑life 2.0 days. \(X\) itself has a half‑life of 8.0 days. Initially no \(Y\) atoms are present.\\ (a) What is the activity of \(X\) after 5.0 days?\\ (b) How many atoms of \(Y\) are present at that time?\\ (c) What is the total activity (from both \(X\) and \(Y\)) after 5.0 days?

Answer Options

Correct Answer A. A_X ≈ 7.8×10^15 Bq, N_Y ≈ 1.9×10^21 atoms, total activity ≈ 1.54×10^16 Bq
B. A_X ≈ 6.5×10^15 Bq, N_Y ≈ 2.3×10^21 atoms, total activity ≈ 1.2×10^16 Bq
C. A_X ≈ 7.0×10^15 Bq, N_Y ≈ 2.0×10^21 atoms, total activity ≈ 1.40×10^16 Bq
D. A_X ≈ 8.2×10^15 Bq, N_Y ≈ 1.5×10^21 atoms, total activity ≈ 1.68×10^16 Bq
Correct Answer
A
Correct Option:
A_X ≈ 7.8×10^15 Bq, N_Y ≈ 1.9×10^21 atoms, total activity ≈ 1.54×10^16 Bq

About This Question

This is Neco Model Questions Vol1 2024 Physics Question 48. It is one of the objective questions from the 2024 Neco Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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