A radioactive sample is a mixture of two radioactive species – one having population `N_(1)`has a mean life of `T_(1)` and the other one having population `N_(2)` has nuclei having mean life of `t_(2)`. Find the effective mean life of the nuclei in the mixture.
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The probaility that a certaun radioactive atom would get disintefrated in a time equal to the mean life fo the radioactive sample is
Correct Answer - B Required probability `P(t) = (N_(0)(1-e^(-lambdat)))/(N_(0)) = 1-e^(-lambda((1)/(lambda)))= 0.63`
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A chalk sample exactly 17.52 gram HCl for complete reaction with all `CaCO_(3)` present in it. If the chalk sample is 72% pure, the mass of sample tak
`CaCO_(3) + 2HCl to CaCl_(2) + H_(2)O+CO_(2)` Moles of HCl `=(17.52)/(36.5)` Moles of `CaCo_(3)=(1)/(2)xx(17.52)/(36.5)` Weight of `CaCO_(3)` required `=(1)/(2)xx(17.52)/(36.5)xx100` Mass of sample taken: `=(1)/(2) xx(17.52)/(36.5)xx(100xx100)/(72)=33.33` gm
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a) Explain "birth rate" in a population by taking a suitable example. b) Write the other two characteristics which only a population shows but an indi
a) Birth rate is expressed as the number of births to existing individuals of a populations in given period of time. Eg. If in a pond of 20 lotus 5...
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a) Explain "death rate" in a population by taking a suitable example. b) Write the other two characteristics which only a population shows but an indi
a) Death rate- It is expressed as the number of deaths to given population in a period of time e.g. if 8 fruitflies in a laboratory population of 40 due...
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(a) What is "population" according to you as a biology student ? (b) "The size of a population for any species is not a static parameter." Justify the
Single individuals of any species living in a groups in a well defind geographical area share or compete for similar resource, inter-breed and thus, constitute a population. (b) The size...
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In a sample there are two radioactive nuclide X and Y. Initially, population of X is 2.5 tiems that of Y. it was observed that 3 days later the popula
Correct Answer - 6 days
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A radioactive sample consists of two isotopes one of then decays by `alpha-` emission with a half life of `tau_(1)=405s` and the other one decays by `
Correct Answer - (a) `(1)/(9)` (b) 1215s
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The half lives of two longest-lived radioactive isotopes of phosphorus `P^(32)` and `P^(33)`, are 14 days and 28 days respectively. A sample has been
Correct Answer - 0.3mCi
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A rock sample has radioactive isotope A that decays into a stable product B. half life of A is `10^(3)` year. It was found that the rock sample contai
Correct Answer - 680y
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A solution contains a mixture of two isotopes A (`half-life=10days`) and B (`half-life=5days`). Total activity of the mixture is `10^10` disintegratio
Correct Answer - `[(a) 0.73xx10^(10) dps 0.27xx10^(10) dps, (b) 5.4]`
2 Answers 1 views