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Radio active series
There are three radio active series depending on their progenitor.
They are
i) Uranium series called (2n+2) series,
ii) Actino-Uranium series, called (2n+3) series and
iii) Thorium series, called 2n series.
The length of a simple pendulum is about 100cm known to have a accuracy of 1mm.Its period of oscillation is 2s determined by measuring the time for 100oscillations using a clock of
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