1.) In a repeat of the Millikan Oil drop experiment, a student found that she could suspend a 1.0 µg oil drop between two parallel plates 1.0 mm apart if she placed a 100 kV potential between the plates. How many electrons where on the oil drop? (e = 1.6 x 10-19 C)
2.) If 70% of a radioactive sample has decayed in 5.0 x 103 years, what is the decay constant of the material?