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Allotropes of Carbon

Which isotope...

Question

Which isotope is used in finding age of fossil of more than 4500 years?

A

^{238}

U

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B

^{235}

U

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C

^{235}

P

_{o}

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D

^{12}

C

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Solution

The correct option is C $^{238}$ U
Uranium-Lead (U-Pb) dating is the most dependable technique for dating Quaternary sedimentary carbonate and silica and fossils particularly outside the scope of radiocarbon. Quaternary geography gives a record of environmental change and topographically ongoing changes in condition.
Uranium-238 and Lead-206 -- 4,500 million (Half-Life in years)
So, the correct option is ' $^{238}$ U'.

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Similar questions

U^{238}

U^{235}

occur in nature in the ratio 140: 1. Assuming that at the time of earth formation, they were present in equal ratio, an estimation of the age of earth is.
The half-life period of

U^{238}

U^{235}

4.5 \times 10^{9}

7.13 \times 10^{8}

year respectively.

Q. The isotopes

U^{238}

U^{235}

occur in nature in the ratio 140 : 1. Assuming that at the time of earth formation, they were present in equal ratio, the estimated age of the age of earth will be :
(The half-life period of

U^{238}

U^{235}

4.5 \times 10^{9}

7.13 \times 10^{8}

years, respectively.)

Q. Assume that the isotope

U^{238}

U^{235}

are found in the ratio 64 : 1 presently at a planet. At the time of the creation of the planet, they were present in an equal ratio.What is the age of the planet (in million years

10^{6}

). The half-life period of

U^{238}

U^{235}

4.45 \times 10^{9}

7.0 \times 10^{8}

year respectively.

Q. The isotopes

^{238} U

^{235} U

occur in nature in the weight ration

140 : 1

. It is assumed that initially they were found in equal weight. If half life

(t_{1 / 2})

^{238} U = 4.5 \times 10^{9}

t_{1 / 2}

235 U = 5 \times 10^{5}

year respectively then the age of earth is

(l o g 7 = 0.846; l o g 2 = 0.3)

Q. Which of the following is true for the following isotopes of uranium
U

^{235}

^{238}

?

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