Which phrase describes radioactive decay? a. the spontaneous emission of radiation
b. the joining of small nuclei into a larger nucleus
c. the triggering of one reaction by the products of another
d. the splitting of a large nucleus into smaller nuclei

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) =_