The right answer is 28 years.
The half-life, or period of a radioactive isotope, is the time required for half of the nuclei of this isotope initially present to decay naturally.
One gram of pure 90 strontium has a radioactivity of 5.11 TBq. Its beta radiation is not penetrating, which makes it difficult to measure when it is in the soil or a matrix. It is very harmful when the particle is inhaled or ingested.
One solution have a nice day please
Cell wall because it protects the cell membrane.
It is a true statement that television is more effective than radio in influencing public opinion because on the television you can see <span>the speaker and observe his movements and gestures, all the little tricks of public speaking.</span><span> The correct option among the two options that are given in the question is the first option.</span>