A laboratory chemically separates out 50 mCi of pure Sr90 to use for research purposes. The Sr-90 is then stored in a vial for 48 hours prior to being used. What is the activity of Y-90 in the sample vial at that time?​

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.