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Smaller the value of half- life period, ...

Smaller the value of half`-` life period, greater is the number of atoms that are disintegrating.

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Fr has half life period of

The radioactivity of sample is R_(1) at a time T_(1) and R_(2) at a time T_(2) . If the half -life of thespeciman is T, the number of atoms that have disintegrated in the time (T_(2)-T_(1)) is equal to :

The radioactivity of a sample is R_(1) at a time T_(1) and R_(2) at time T_(2) . If the half-life of the specimen is T, the number of atoms that have disintegrated in the time (T_(2) -T_(1)) is proporational to

The activity of a nucleus is inversely proportional to its half of average life. Thus, shorter the half life of an element, greater is its radioactivity, i.e., greater the number of atomsd disintegrating per second. The relation between half life and average life is t_(1//2) = (0.693)/(lambda) = tau xx 0.693 or tau = 1.44 t_(1//2) The half life of a radioactive element is 10 years. What percentage of it will decay in 100 years?

CENGAGE CHEMISTRY-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 lead.

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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. Control rods of calcium or boron are inserted into the nuclear reactor...

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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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