Kayla drew two ray diagrams to compare the behavior of light rays. what do the diagrams illustrate?

Could someone . i have tried to solve myself but my calculation is off

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) =_

Use 4 to 5 complete sentences, explain the concepts of beats and how beats are produces.