What is the physical meaning of half-life?

Half-life is the period of time during which half of the original number of atoms decays. There is a possibility of decay of each atom separately, so the half-life does not depend on the initial number of particles.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.