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An amplifier has an open-loop, gain of 10,000 and a bandwith of 2MHz. Its input and output impedances without feedback are 50Kohm and 500ohm respectively. If the gain is subsequently reduced to 50, by application of negative feedback determine

a) The new bandwidth

b)The feedback fraction Beta

c)input impedance

d) Output impedance.

I think I can work out the Feedback fraction I make it to be, 0.0199.

But Im not sure on the rest, my notes don't tell me any way of working out the new bandwith or impedances.

Please can someone help me? Any formulas or hints apprecited.

Thanks in advanced Everything helps!