Recent content by SSJVegetto

Hi Andy, I'm sorry but i still don't quite understand the nature of the problem. What angle when sin(q) = q are we talking about here I think it should be the angle with the optical axis but i don't understand? Can you make it more clear with a picture or something? And where does the...

Hello all, Can someone explain why barrel distortion is present by lenses and if it is related to Spherical aberation yes or no? Descriptions tell us that this is caused by the magnification being less when the distance from the optical axis increases. What magnification how can i understand...

That is not going to be an option! Since then the entire device won't work the way its supposed to..

Well the bacteria are going to get really concentrated at 1 spot and the size of that spot is dependent on the number of bacteria... and yes i meant the turbidimetric measurement with optical density measurement. Thank you for your reply!

Hi all, i'm currently working on a project but i need to find a way to count bacteria i have to be able to tell the difference between 10^4 and 10^5 bacteria/mL. This should be done optically but I'm open for any suggestions. I have read something about optical density and flow cytometry...

Hello all, I have the following differential equation: x' = f(x) + a with f(x) = (x+1)^{2}.(1-x) Now i have the following questions: 1. Sketch the phaseline for x' = f(x) + a with a = -2, -1, 0, 1 Don't calculate the exact intersections but make a qualitative correct picture. 2...

Thank you for your answers! :D It helps me a lot! I'm trying to calculate the value now but i don't seem to quite get it. You say i need to calculate it using E = hc/lambda right? That should be equal to the energy difference then right or how should i see this? I said previously that the...

It seems to me MATLAB doesn't like the way you call the function regress. See http://www.mathworks.com/help/toolbox/stats/regress.html". If you need any help just ask but i think you should get the answer by reading the link i gave you! You have to many arguments and i think you want to put the...

Homework Statement Reflection at a surface takes place under the condition that the field amplitude is zero at the reflecting surface. As a result, the axial modes i of wavelength λi inside a laser cavity can be defined by their number ni of sine-wave half cycles that fit exactly into the...

If you really want to understand more just watch this video: http://video.google.com/videoplay?docid=-2978729867097229598#"

Ok and when do i know i have to use degeneracy? When will we be talking about degenerate energy levels? And thank you! :D I used a temperature of 300 K which is room temperature i assume? Also what you are saying i don't really get? The energy difference between two states is equal to the...

Homework Statement Assume a two-energy-level system with energetic separation between the two levels of 10000 cm-1 (as you can easily see, λ = 1 μm equals 1/λ = 10000 cm-1, and E ∝ 1/λ, i.e. the unit [cm-1] defines an energy). a) What is the thermal population in the upper level? b) If you pump...

Since the outer sphere is a conducting sphere the charges will be attracted to one side of the sphere due to the electric field caused by the charge at the center. So the field when the charge is positive is directed radially outward, this causes the elctrons to move to the inner part of the...

Or maybe using a lens?

The colors separate because every color has a different wavelength and is refracted at a different angle. The same thing a prism does is happening within a water droplet. See: http://en.wikipedia.org/wiki/File:Rainbow1.svg"...