Suppose that the sound level of a conversation is initially at an angry 72 db and then drops to a soothing 53 db. assuming that the frequency of the sound is 522 hz, determine the (a) initial and (b) final sound intensities and the (c) initial and (d) final sound wave amplitudes. assume the speed of sound is 343 m/s and the air density is 1.21 kg/m3.

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) =_