Recent content by nbky

It s CdSe. So wavelength is another variable for absoption. My main task is to compare this teorotical result with experimental result. I did the experiment with many dichoric filters. For example with red filter the absorption was 1,09. when i evaluate teoric curve the red area (615-730) the...

I did -ln(I/I0) and the result is here: It doesn't seem right to me. Absoprtion coefficient doesn't related with coefficient acourding to lambert beer law. am i right? So i think it should be like constant not exponential.

And what is the area under the curve. I couldn't estimate that. I though the ratio of the areas under curves give the result. Is it correct?

Homework Statement I have data of an experiment to find absorption coefficient of a sample. one curve shows intensity of original beam, the other one is intensity with sample (with coefficient). Here is the data : Homework Equations Where: I = the intensity of photons transmitted across...

I did my work and sent. And i get the feedback and i just want to inform you just in case maybe someone else stuck same kind of problem. First of all i learned it was a tricky question. You cannot find efficiency just using data in dark. You need to combaine that with at least short circuit...

it s me again.i made some progress. As you know the data is exponential, starts from origin (ectually close to origin). if i get the exponential equation from graph (like y=a*e^b), i could find I0 and "n". So the n is ideality factor of solar cell. So do you think is it the answer?

I haven't find the solution for 5 hours.now i think there is no "efficiency in dark". I guess it behaves like diode and the "efficiency" is ideality factor. do you agree with me? If it is so i have new problem: here the equation: i have voltage and current in my data. others are constant. And...

Hi mates, I have to find solar cell efficiency by datas that given. These datas comes from an experiment in light and in dark. I found efficiency in light by square method with IV curve. But i don't know how to find in dark. The square method doesn't work cos data crossing the origin, no area to...

Hi, I am an undergrad student.And i can say that my degree is well.But i think it s time to focus on a field.I like electronics and i m good at it.But i can't decide which field i should choose. i can go to europe for master degree (it s common way for physics student in Turkey who is...

i solved the problem. tempeture of radiation and tempeture of gas are equal.And when i add a equation on the problem which is P=GM^2/R^4, i solve the problem.

first sorry for my english. i wrote the problem and equations.the result is: critical mass of a star =2,5x mass of the sun. but i couldn't find the result.pls help me to find the result with this equations.