Consider the circuit represented in a) where C1=9,31 nF, R1=138,8 KΩ and  R2=216,0 KΩ .

Consider circuit b) and the values for Rth and Vth previously obtained.

Consider that after having been set to V1 for a long time, the voltage is set to Zero. Consider this instant as t=0.

Sould the transient response be  given by

Vc_trans(t)= A. e^s.t

 Please give the value for parameter s. 

Hint: please have in mind that C1 is in nF and the resistors are in KΩ