Sean is conducting an experiment with an isotope of a particular element that has a half life of 4 hours. He begins with a sampl
e of the isotope with a mass of 92 grams. He then measures the mass of the object every hour. What is the approximate mass of the sample after 20 hours. Choices are: A: 2.875 B:2,944 C:1.4375 D:0.0313
