Neco 2017 Physics Question 16

Practice objective / multiple choice question 16 from the 2017 Neco Physics examination.

Neco 2017 Physics Objective / Multiple Choice Hard Difficulty

Question 16 NECO • 2017 • PHYSICS • objective

An isotope X (atomic mass 238 u) decays by alpha emission, releasing 5.00\,MeV per decay. A 2.00\,g sample of X has a half‑life of \(4.5\times10^{8}\)\,years. (i) How long will it take for the sample to reduce to one‑eighth of its original mass? (ii) How much total energy in joules will be released during this period? (Use \(1\ \text{eV}=1.602\times10^{-19}\ \text{J}\).)

A. 1.35×10^8 years, 3.55×10^8 J

B. 2.70×10^9 years, 7.10×10^9 J

Correct Answer C. 1.35×10^9 years, 3.55×10^9 J

D. 1.35×10^9 years, 5.33×10^9 J

Correct Answer

Correct Option:

1.35×10^9 years, 3.55×10^9 J

This is Neco 2017 Physics Question 16. It is one of the objective questions from the 2017 Neco Physics examination.

Difficulty level: Hard .

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