Huntruh2842
08.02.2021 •
Mathematics
There are other isotopes of cerium which are radioactive.
Different isotopes of cerium have different half-lives.
The half-life of an isotope can be found by studying how the number of atoms
changes over time.
Figure 7 shows how the number of atoms of cerium-148 in a 120 g sample changes
over time.
Figure 7
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Ответ:
Angle PQR = 120°
Step-by-step explanation: