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Conductivity of a photodiode starts chan...

Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660nm .The band gap of photodiode is found to be `((X)/(8))eV` .The value of "X" is :
(Given,`h=6.6times10^(-34)Js,e=1.6times10^(-19)C` )

A

15

B

11

C

13

D

21

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