1.

Ratio of number density of holes is (7)/(5) and ratio of their current is (7)/(4) in a semiconductor. The ratio of their drift velocity is …….

Answer»

`(4)/(7)`
`(5)/(8)`
`(4)/(5)`
`(5)/(4)`

Solution :`(5)/(4)`
CURRENT in semiconductor `I=nAv_(d)e`
`THEREFORE v_(d)=(I)/(nAe)`
`therefore v_(d ) prop (I)/(n) [because "A, e constant"]`
`therefore ((v_(d))_(e))/((v_(d))_(h))=(I_(e ))/(I_(h))xx(n_(h))/(n_(e ))`
`=(7)/(4) xx (5)/(7)=(5)/(4)`


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