The current amplification factor `alpha` of a common base transistor and the current amplification factor `beta`of a common emitter transistor are not related by

Options

A. `alpha=beta/(1+beta)`
B. `beta=alpha/(1-alpha)`
C. `1/alpha-1/beta=1`
D. `beta=alpha/(1+alpha)`

Answer

D

Explanation

As `beta=alpha/(1-alpha)`, so `alpha=beta/(1+beta)` and `1/alpha=1/beta+1`