# NEET Physics Nuclei Questions Solved

Carbon-14 decays with half-life of about 5,800 years. In a sample of bone, the ratio of carbon-14 to carbon-12 is found to be $\frac{1}{4}$ of what it is in free air. This bone may belong to a period about x centuries ago, where x is nearest to
(a) 2$×$58                        (b) 58
(c) 58/2                          (d) 3$×$58

(a) To becomes $\frac{1}{4}$th, it requires time of two half lives
i.e., t = 2(${\mathrm{T}}_{1/2}$) = 2$×$5800 = 2$×$58 centuries

Difficulty Level:

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