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A sample of uranium mineral was found to...

A sample of uranium mineral was found to contain `Pb^(208)` and `U^(238)` in the ratio of 0.008 : 1. Estimate the age of the mineral (half life of `U^(238)` is `4.51 xx 10^(9)` years).

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The correct Answer is:
1.7 mg
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A uranium mineral contains .^(238)U and .^(206)Pb in the ratio of 4 : 1 by weigh. Calculate the age of the mineral, t_(1//2) .^(238)U = 4.5 xxx 10^(9) years. Assume that all the lead present in the mineral is formed from disintegration of .^(238)U .

In a smaple of rock, the ration .^(206)Pb to .^(238)U nulei is found to be 0.5. The age of the rock is (given half-life of U^(238) is 4.5 xx 10^(9) years).

(a) On analysis a sample of uranium ore was found to contian 0.277g of ._(82)Pb^(206) and 1.667g of ._(92)Pb^(206) and 1.667g of ._(92)U^(238) . The half life period of U^(238) is 4.51xx10^(9) year. IF all the lead were assumed to have come from decay of ._(92)U^(238) , What is the age of earth? (b) An ore of ._(92)U^(238) is found to contain ._(92)U^(238) and ._(82)Pb^(206) in the weight ratio of 1: 0.1 The half-life period of ._(92)U^(238) is 4.5xx10^(9) year. Caluculate the age of ore.

On analysis a sample of uranium are was found to contain 227g of ._(82)Pb^(208) and 1.667 g of ._(92)U^(238) . The half life peiod of U^(238) is 4.51 xx 10^(9) yrs. If all the lead was assumed to have come from decay of ._(92)U^(238) , what is the age of the earth?

In a sample of pitchbende, the atomic ratio of .^(206)Pb : .^(238)U is 0.23 : 1. Calculate the age of the mineral if half life of uranium is 4.5 xx 10^(9) years. Assume that all lead has originated from uranium.

Find the amount of ""_(92)U^(238) required to produce a-particles of 20 millicurie strength. The half-life of ""_(92)U^(238) is 4.5 xx 10^(9) years.

RESNICK AND HALLIDAY-THE NUCLEUS-PROBLEMS
  1. Consider an initially pure M gm sample of X, an isotope that has a hal...

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  2. Under certain circumstances, a nucleus can decay by emitting a particl...

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  3. A sample of uranium mineral was found to contain Pb^(208) and U^(238) ...

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  4. In the following list of nuclides, identify (a) those with filled nucl...

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  5. A radioactive isotope has initial activity of 28 dpm Its activity is r...

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  6. कुछ विशिष्ट परिस्थितियों में एक नाभिक alpha कण से अधिक द्रव्यमान वाला ...

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  7. The strong neutron excess (defined as N - Z) of high- mass nuclei is i...

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  8. An isotope of Potassium .(19)^(40) K has a half life of 1.4 xx 10^(9...

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  9. In 1992, Swiss police arrested two men who were attempting to smuggle ...

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  10. A radiation detector records 9500 counts in 1.00 min. Assuming that th...

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  11. In a nuclear reactor an element X decays to a radio active element Y a...

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  12. If the binding energy per nucleon of deuterium is 1.115 MeV, its mass ...

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  13. (a) Define atomic mass unit. What is its symbol ? (b) Define atomic...

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  14. Consider a nuclear reaction A+B rarr C. A nucleus A moving with kinet...

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  15. A given coin has a mass of 3.0 g. Calculate the nuclear energy that wo...

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  16. The radionuclide .^(56)Mn is being produced in a cyclontron at a const...

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  17. The half-life of a certain radioactive isotope is 32 h.What fraction o...

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  18. If the activation energies of the forward and backward reactions of a ...

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  19. The radionuclide ""^(64)Cu has a half-life of 12.7 h. If a sample con...

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  20. Calculate the nearest distance of approach of an alpha-particle of ene...

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