Aparticular radioactive isotope has a half-life of 5.0 s. what fraction of the original amount of isotope will remain in a sample after 20.0 s?

Temperature is defined as a. the equivalent of heat. b. a measure of the average kinetic energy of the individual atoms or molecules composing a substance. c. how hot or cold it is. d. the total kinetic energy of the atoms or molecules composing a substance. e. none of the above is correct.