Finding alpha and IB in common-base transistor configuration

[Agent]

Hey, I'm currently stuck with this question. There are several parts to this question.

http://img373.imageshack.us/img373/8480/questionscj3.png

I know alpha should be around .9-1 but I don't think I know the formula for IB.

 

[NoTime]

Hey, I'm currently stuck with this question. There are several parts to this question.

http://img373.imageshack.us/img373/8480/questionscj3.png

I know alpha should be around .9-1 but I don't think I know the formula for IB.

In part A) Ie = 4 and and Ic = 3.992

What does Ib have to be?

 

[SGT]

Use KCL for the transistor. What are the currents entering and leaving it.