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A sample of ""^14CO2 was to be mixed w...

A sample of `""^14CO_2` was to be mixed with ordinary `CO_2` for biological tracer experiment. In order that 10 cc (NTP) of the diluted gas should have 104 disintegrations per minute, how many microcuries of radioactive carbon are needed to prepare 60 litres of the diluted gas?

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`27 mu Ci`
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A sample of .^(14)CO_(2) was to be mixed with ordinary CO_(2) for a biological tracer experiment . In order that 10 cm^(3) of diluted gas should have 10^(4) "dis"//"min" , what activity (in muCi ) of radioactive carbon is needed to prepare 60L of diluted gas at STP. [ 1Ci=3.7 xx10^(10)dps ]

Ram was a daily wage worker in a factory. He was suffering from Cancer. On hearing this, most of his co-workers, started avoiding him under the impression that it was a contagious disease. When Prof. Srivastava came to know about this, case, he took him to a leading radiologist, who examined him and told that it was at the beginning stage. He advised that it could be easily cured and also certified that it was not a communicable disease. After this, Ram was given proper treatment by the doctor and got cured completely. (1) What moral values did Prof. Srivastava display ? (2) How is mean life of a radioactive element related to its half life? (3) A radioactive sample has activity of 10,000 disintegrations per second after 20 hours . After next 10 hours, its activity reduces to 5,000 dps. Find out its half - life and initial activity.

Avogadro's law states that under similar condition of T and P, equal number of particles. Experiments show that at one atmosphere pressure and at a temperature 273 K (i.e. at STP) one mole of any gas occupies a volume approximately 22.4 litre. Therefore number of moles of any sample of gas can be found by comparing its volume at STP with 22.4. 1 mole of any species contains 6.023xx10^(23) particles which is denoted by symbol N_(A) . Number of atoms present in 1 gm-atom of an element or number of molecules present in 1 gm-molecule of any substance is equal to N_(A) . Hence it is number of particles present in one mole of the substance. At STP 11.2 L of CO_(2) contains.

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