106. Solving a chemistry problem
67. During the experiment, a sample of soil gave 160 pulses per second on the Geiger-Muller counter. After 16 days, this sample gave 40 pulses per second. Estimate the half-life of a radioactive isotope introduced into the soil.
If you do not open the file - install the RAR archiver. Inside the archive you will find a solution in Word format.
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