The half-life of argon-44 is 12 minutes. Suppose you start with 20 atoms of argon-44 and wait 12 minutes. how many atoms of argon-44 will be left?

5 atoms
20 atoms
40 atoms
10 atoms

Which object is most likely represented by a dot?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Una carga puntual de 3 x 10-6 c se coloca a 12 cm de una segunda carga puntual de - 1,5 x 10-6 c. calcular la magnitud fuerza eléctrica entre las cargas