Acurrent of 120 ma flows past a point in a circuit for 25 s.
how much charge passes the point in this time?
how many electrons pass the point in this time?

J. j. thomson’s experiment disproved the theory that an atom

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

To a of 4 x hz is 1. 0. mm nm nm