Kindly Aswer these question if you can.. Thank you

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Discussion in 'Homework Help' started by Umer221, Oct 9, 2012.

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  1. Oct 9, 2012 #1
    Umer221

    Thread Starter New Member

    Oct 9, 2012
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    • A red LED is operated in pulse mode with 80 mA of peak current applied at a duty cycle of 20%. VD is 1.9 volts.
    a.) Determine the average LED current.
    b.) Assuming a dynamic resistance of 50 ohms calculate the average power dissipation of the LED component.




    2.

    • ...A silicon junction generates an electron differential of 1.09 eV. What
    radiated wavelength will propagate with this condition?








    • A particular LED has a reference intensity of 12 mcd at a reference current of 10 mA. The component has a peak current of 100 mA with an efficiency of 1.5. A pulsed operation implements a duty cycle of 20 percent. Determine the average intensity of the LED.
     
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  2. Oct 9, 2012 #2
    bertus

    Administrator

    Apr 5, 2008
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  3. Oct 9, 2012 #3
    Umer221

    Thread Starter New Member

    Oct 9, 2012
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    Thank you very much for your reply,,
    I'm doing Post Graduate Certificate in Advanced Lasers..
    I am in hurry because I have to submit my assignment on 12th of October.. Can you tell me where I can find the help regarding these question,, I can study about these questions and solve these my self, Can you just tell me the related category where I can find some help to find the related formulas and some help?
    Regards..
     
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  4. Oct 10, 2012 #4
    WBahn

    Moderator

    Mar 31, 2012
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    The first question is basically sophmore Circuits I (at least in many places). Part of it is a trick question.

    The rest is primarily from a Solid State and/or Optical Electronics course.
     
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  5. Oct 10, 2012 #5
    Ron H

    AAC Fanatic!

    Apr 14, 2005
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    Commonly known as a red herring.:)

     
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