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(v) When doping a semiconductor p type, thebulk of the material has:

      A positivecharge

       Anegative charge

       Is neutral

        Willonly get a positive charge when we apply a voltage

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(vi) In order to generate free charge carriersby optical excitation, the wavelength of the incident light needsto be:   

      Monochromatic(single wavelength)

       Longerthan the cut-off wavelength of the material

       Shorter than thecut-off wavelength of the material

        Ofa very high intensity to penetrate the material

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(vii) Light of the correct wavelength toproduce optical excitation is incident on a piece a p-type Si. Thiswill produce:

      A greaternumber of holes than electrons

       Agreater number of electrons than holes

       A greater change inthe number of holes relative to the number before illumination

        Agreater change in the number of electrons relative to the numberbefore illumination.  

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(viii) Compared to silicon, compound semiconductors suchas GaAs will always:

      Have adirect bandgap

       Bemore expensive to produce

       Be easier todope  

       Allowus to easily vary the bandgap.   

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