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The ratio of C^(14)//C^(12) in dead tiss...

The ratio of `C^(14)//C^(12)` in dead tissue is less than that in fresh tissue.

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A 25 g piece of characoal is found in some ruins of an ancient city. The sample shows a C^(14) activity of 250 decay/minutes. How long has the three this charcoal came from been dead ? Given, the half-life of C^(14) is 5730 years. The ratio of C^(14) and C^(12) in the living sample is 1.3 xx 10^(-12) .

A piece of wood was found to have C^(14)//C^(12) ratio 0.6 times that in a living plant. Calculate that in a living plant. Calculate the period when the plant died. (Half life of C^(14) = 5760 years)?

The activity of the hair of an Egyptian mummy is 7 disintegration "min"^(-1) of C^(14) . Find an Egyptian mummy. Given t_(0.5) of C^(14) is 5770 year and disintegration rate of fresh sample of C^(14) is 14 disintegration "min"^(-1) .

A hospital uses an ultrasonic scanner to locate tumours in a tissue. The operating freqency of the scanner is 3.2 MHz. The speed of sound in a tissue is 1.6 km s^(-1) . The wavelength of sound in the tissue is a) 0.25 mm b) 0.5 mm c) 0.75 mm d) 1 mm

Name the following. (a) Tissue that forms the inner lining of our mouth. (b) Tissue that connects muscle to bone in humans. (c) Tissue that transports food in plants. (d) Tissue that stores fat in our body. (e) Connective tissue with a fluid matrix. (f) Tissue present in the brain.

Carbon -14 used to determine the age of organic material. The procedure is absed on the formation of C^(14) by neutron capture iin the upper atmosphere. ._(7)N^(14)+._(0)n^(1) rarr ._(6)C^(14)+._(1)H^(1) C^(14) is absorbed by living organisms during photosynthesis. The C^(14) content is constant in living organism. Once the plant or animal dies, the uptake of carbon dioxide by it ceases and the level of C^(14) in the dead being falls due to the decay, which C^(14) undergoes. ._(6)C^(14)rarr ._(7)N^(14)+beta^(c-) The half - life period of C^(14) is 5770 year. The decay constant (lambda) can be calculated by using the following formuls : lambda=(0.693)/(t_(1//2)) The comparison of the beta^(c-) activity of the dead matter with that of the carbon still in circulation enables measurement of the period of the isolation of the material from the living cycle. The method, however, ceases to be accurate over periods longer than 30000 years. The proportion of C^(14) to C^(12) in living matter is 1:10^(12) . A nuclear explosion has taken place leading to an increase in the concentration of C^(14) in nearby areas. C^(14) concentration is C_(1) in nearby areas and C_(2) in areas far away. If the age of the fossil is determined to be T_(1) and T_(2) at the places , respectively, then

The fossil bone has a .^(14)C : .^(12)C ratio, which is [(1)/(16)] of that in a living animal bone. If the half -life of .^(14)C is 5730 years, then the age of the fossil bone is :

The present activity of the hair of Egyption mummy is 1.75 dpm t_(1//2) of ._(6)^(14)C is 5770 year and disintegration rate of fresh smaple of C^(14) is 14 dpm . Find out age of mummy.

CENGAGE CHEMISTRY ENGLISH-NUCLEAR CHEMISTRY-Exercise True/False
  1. The alpha- rays have more penetrating power than gamma- rays.

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  2. Radioisotopes of elements have same atomic number.

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  3. Smaller the value of half- life period, greater is the number of atoms...

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  4. Radon, actinon, and thoron are isobars.

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  5. The last member of 4n+1 series is an isotope of …………………………………. .

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  6. Gamma rays produce maximum ionization in gases.

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  7. The radioactive decay follows zero- order kinetics.

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  8. Pu^(239) is an artificial fissile material.

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  9. The control rods used in a muclear reactor can be made up of

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  10. I^(131) is unsed to study the activity of thyroid gland.

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  11. Alpha particles are positively charged.

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  12. Tritium is beta- radioactive in nature.

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  13. The atomic reactor when used to generate electricity is termed breeder...

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  14. The nuclear activity of a neutral atom and its ion is always the same.

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  15. A positron is as heavy as a proton.

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  16. The percentage efficiency of nuclear fissiion is higher than nuclear f...

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  17. The ratio of C^(14)//C^(12) in dead tissue is less than that in fresh ...

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  18. The SI unit of radioactivity is curie.

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  19. All radioactive elements which emit beta- rays have the same half - l...

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  20. The emission of an alpha- particle reduces the mass of nuclei by 4 uni...

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