$3.(6\mathrm{.}37)$ Consider

Rn $$ Rp $$

Cn Cp Nt $$np $$ n $$

$2$

$$

$$ R $,$

Cn $($ n $$ n$\text{'}$ Cp $$p $$ p$\text{'}$

and the definitions:

$$ p$0$

$1$

Cp Nt

and$$ n$0$

$1$

Cn Nt

$.$ Let $$p$0=10-7$ s and $$n$0=5\backslash$times

$10-7$ s$.$ Also let n$=$ p$=$ ni $=1010$ cm$-3.$ Assume very low injection so that $$n

$<<$ ni$.$ Calculate R$/$n for a semiconductor which is $($a$)$ n$-$type $($n$0>>$ p$0)$; $($b$)$ intrinsic $($n$0=$ p$0=$ ni$)$; $($c$)$ p$-$type $($p$0>>$ n$0)$