In a semiconducting material the mobilit...

In a semiconducting material the mobilities of electrons and holes are `mu_(e)` and `mu_(h)` respectively. Which of the following is true?

`mu_(e )gt mu_(h)`

`mu_(e )lt mu_(h)`

`mu_(e )=mu_(h)`

`mu_(e )lt 0 , mu_(h) gt 0`

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