1. The concentration of tritium atoms in the air is 5* 10-15 mol/l. The half-life of tritium is 12 years. In how many years will 90% of the tritium contained in the air decay?

If you cannot open the file or have any problems, do not rush to leave a negative review! Contact me and I will quickly help you solve the problem. After purchasing, please leave a positive review of the product :)