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Study Of LED and Detector Characteristics
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1)What light source has been used in the transmitter? 
  

2)Which one is correct? 
  

3)Which term from the following is not related to LASERs? 
  

4)A photodiode is constructed of GaAs, which has a band gap energy of 1.43eV at 300K. The long wavelength cut-off (λc) for GaAs is 
  

5)Typical efficiency for green LED is 
  

6)From the following, what is a method of mixing colors to produce white light from an LED? 
  

7)Typical efficiency for red LED is 
  


  


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