After three half-lives, what fraction of a radioactive sample has decayed

5/6
1/2
7/8
2/3

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

The charge on an electron is 1.60218 × 10−19 c and its mass is 9.10939 × 10−31 kg. how strong a magnetic field must be experienced by the electron if its path is a circle of radius 5.5 cm? answer in units of t.

The photo shows sugar dissolved into a solution with excess sugar at the bottom of the jar this type of solution is classified as a. unsaturated b. compound c. saturated d. plasma