Henri becquerel discovered this element was radioactive when he stored a piece of it in a dark drawer with some film. a couple days later, upon developing his film, he saw an image of the element on the film. which element did he discover was radioactive?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

In the circuit, the switch s has been open for a long time and r = 125 kohm. it is then suddenly closed. (a) determine the time constant before the switch is closed. s (b) determine the time constant after the switch is closed. _ s (c) let the switch be closed at t = 0. find the current in the switch as a function of time. (use t for time. express your answer in milliamps and seconds.) i(t) =_