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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Structure of Atom

Olympiad workbook · NSEC · Structure of Atom

Decay of radioisotopes follows first order kinetics. Radioisotope...

Decay of radioisotopes follows first order kinetics. Radioisotope

U^{238}

undergoes decay to a stable isotope,

\mathrm{Th}^{234}

. The ratio of the number of atoms of

\mathrm{U}^{238}

to that of

\mathrm{Th}^{234}

after three half lives is

Options

A $1 / 3$
B3/4
C $1 / 4$
D $1 / 7$

Correct answer

D. $1 / 7$

Step-by-step solution

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