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7.Assuming VCEsat= 0.2 V and β = 50, find the minimum base current (IB) required to drive the transistor given in the figure to saturation.



 
 
 

6. Determine the wavelength of light emitted from LED which is made up of GaAsP semiconductor whose forbidden energy gap is 1.875 eV. Mention the colour of the light emitted (Take h = 6.6 × 10–34 Js).



 
 
 

5.Four silicon diodes and a 10 Ω resistor are connected as shown in figure below. Each diode has a resistance of 1Ω. Find the current flows through the 10Ω resistor.




 
 
 
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