Recent content by adamjford

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    How to Design a 4-20mA Circuit for a Photodiode with Variable Light Intensity?

    Homework Statement Okay so I've got a photodiode with reverse current linear dependence of 0.3uA/Lux and dark current of 20nA. I need to design a circuit (4-20mA current transmission system) with 4mA at zero light intensity and 20mA at 4x10^4 Lux. The Attempt at a Solution Struggling! I...
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    Complex dielectric constant implies absorption?

    Thanks everybody for all your help. Much appreciated!
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    Complex dielectric constant implies absorption?

    Also... will a negative imaginary part correspond to the medium transferring energy to the wave, as opposed to absorbing from it?
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    Complex dielectric constant implies absorption?

    Thanks! And my reasoning is sound, yeah?
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    Complex dielectric constant implies absorption?

    Thanks for the reply, I've used Omar's "Elementary Solid State Physics", Kittel, and the study guide given to us by our lecturer. Your second method sounds good to me... I think the penny may finally drop if I can firstly show that dQ/dt is the integral you mentioned, and subsequently show that...
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    Complex dielectric constant implies absorption?

    Hi everyone, My very first post after simply using physicsforums as a (very) handy FAQ resource. Okay, so my question is probably pretty simple, but I've been unable to find anything on here already. How does a complex dielectric constant imply the absorption of EM radiation? I...
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