You place a light bulb 8 cm in front of a concave mirror. you then move a sheet of paper back and forth in front of the mirror. the image of the light bulb focuses on the paper when the paper is 12 cm in front of the mirror. what is the focal length of the mirror? show work too.

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

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) =_

The particles that are found in the nucleus of an atom are