A radio isotopesX with a half life 1.4xx...

A radio isotopesX with a half life `1.4xx10^9` years decays of Y which is stable . A sample of the rock from a cave was found to contain X and Y in the ratio `1:7` . The age of the rock is:

`1.96 xx 10^9` years

`3.92 xx10^9` years

`4.20 xx 10^9` years

`8.40 xx 10^9` years

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The half life of a radioactive isotopes 'X' is 20 years . It decays to another element 'Y' which is stable . The two elements 'X' and 'Y' were found to be in the ratio of 1:7 in a sample of a given rock. The age of the rock was estimated to be :

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A radioactive nucleus X converts into stable nucleus Y. Half-life of X is 50 years. Calculate the age of radioactive sample when the ratio of X and Y is 1 : 15.

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U^238 decays to (Pb)^206 with a half-life of 4.47xx10^9 y.The ratio of number of nuclei of pb to u 238 after a time of 1.5 .10 power 9 years given 21/3=1.26

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A first order reaction is found to have a rate constant k=7.39xx10^(-5)s^(-1) . Find the half life of this reaction.

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