What Is the meaning of density

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Which of the following are used in an electrochemical cell? a. electrodes b. electrolyte c. terminals d. all of the above