Explain why it is important to assume that the rate of radioactive decay aka radioactivity will remain constant over time?
I do not need a direct full answer to the question but I would appreciate a simplified explanation of the concepts surrounding this question because I want to understand. Many thanks to anyone who can help.

The diagrams to the right show the distribution and arrangement of gas particles in two different containers. according to kinetic-molecular theory, which of the following statements is true? check all that apply. if the temperatures of both containers are equal, container a has greater pressure than container b. if the volume of container a decreased, its pressure would decrease. if the pressure in both containers is equal, container a has a lower temperature than container b.