Impedance Definition and 507 Threads

Can anyone here use Bohr's analysis of the hydrogen atom, to compute the characteristic impedance of the vacuum? And if not, then how would the Bohr model need to be modified, in order to obtain Z0? Characteristic impedance of the vacuum = Z_0 = 376.730 313 461 ohms CODATA value...

hi, i want to ask, what is the impedance across a resisitor? isn't it just the value of the resistor? say i have a resistor of 50ohms, then its impedance is 50ohms, right?? thanks!

I am supposed to calculate the gain of the circuit given in the attachment. I have attached it in a word file. Z is the generic term for the effective resistance. I get that Z is Z = [jwL +(R/jwC)]/(R+1/jwC) Can someone tell me if this is correct? Also, now for the gain, it is...

i know that output impedance of an op-amp is very small compared to its input impedance. is there any purpose of having a high input impedance and small output impedance?

You are given a capacitor( impedance 100 ohms), an inductor (impedance 300 ohms) and a resistor (400 ohms), all connected in series. Determine the impedance( in ohms) of this circuit.

Ok I have this question that I am finding hard to answer. I understand that you guys won't answer homework questions but all I ask is a little point in the right direction. Heres the question anyway. An amplifier has an open-loop, gain of 10,000 and a bandwith of 2MHz. Its input and output...

What is Vacuum Impedance? In electronics, I would assume that it means some ohmic resistence to alternating EM signals. In vacuum, I understand it is necessary property, elasticity, for vacuum to be able to transfer energy waves. Is it some universal constant? In wires, conductor needs to...