1. lodine-123 is used to study thyroid gland function. This radioactive isotope breaks down in a first-order process with a half life of 13.1 hr. What is the rate constant for for the process?

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?