Q. Two radioactive nuclides $x$ and $y\ $have half-lifes 1 h and 2 h respectively. Initially the samples have equal number of nuclei. After 4 h the ratio of the numbers$\ x$ of$\ y\ $and is

A) $\frac{1}{2}$
B) 2
C) $\frac{1}{4}$
D) 1
Explanation

(c) $\frac{N_{1}}{N_{2}} = \frac{(1/2)^{4/1}}{(1/2)^{4/2}} = \frac{(1/16)}{(1/4)} = \frac{1}{4}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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