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Discussion in 'Homework Help' started by kkhh, Jan 3, 2013.

1. ### kkhh Thread Starter New Member

Jan 2, 2013
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0
. The absorption coefficient for GaAs at λ = 633 nm is α = 3×10^6m-1
. Find, what percentage of the incident light will pass through the layer, the thickness of which is:
1) 200 nm; 2) 500 nm; 3) 1 µm; 4) 2 µm; 5) 10 µm;
i have tried solving the question but didn't find it in the materials
i have found I=I0exp(-ax)
where a is absorption cofficient and x s the thickness

thank you very much

2. ### Brownout Well-Known Member

Jan 10, 2012
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Try a physics forum.

3. ### GopherT AAC Fanatic!

Nov 23, 2012
7,983
6,786
Beer Lambert law,
A=abc

b=thickness of sample
c= concentration

Since concentration is always constant, set it equal to 1. Your co-efficient is in micrometers so re-adjust all sample thicknesses to micrometers.

4. ### WBahn Moderator

Mar 31, 2012
24,564
7,701
Q1) This should be in the Homework Help section.