Define the activity of a radionuclide. Write its SI unit. Give a plot of the activity of a radioactive species versus time.

Define the activity of a radionuclide. Write its SI unit. Give a plot

1.	Define the activity of a radionuclide. Write its SI unit. Give a plot of the activity of a radioactive species versus time.
Answer» The total decay rate of a radioactive sample is called the activity of the sample. The S.I unit of activity is Becquerel (Bq).

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(i) Arrange the following compounds in an increasing order of basic strength : `C_(6)H_(5)NH_(2), C_(6)H_(5)N(CN_(3))_(2), (C_(2)H_(5))_(2)NH and CH_(3)NH_(2)` (ii) Arrange the following compounds in a decreasing order of `pK_(b)` values: `C_(2)H_(5)NH_(2), C_(6)H_(5)NHCH_(3), (C_(2)H_(5))_(2) NH and C_(6)H_(5)NH_(2)`
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Define the activity of a radionuclide. Write its SI unit. Give a plot of the activity of a radioactive species versus time.

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