Question: 1 . A low - level injection process in a p - type semiconductor doubles the number of free electrons. After the injection is stopped,

1 .

A low

-

level injection process in a p

-

type semiconductor doubles the number of free electrons. After the injection is stopped, how long will it take for the number of electrons to fall within

1 %

of their thermal equilibrium value? Assume a minority carrier lifetime of

1

millisecond.

[10

pts

]

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