Recent content by kubajed

I have other question: how much photons (in visible range) will be registered in detector located 10cm far with diameter 1mm in 100ps?

Which one of them is that what I am looking for? On this site is calculator too. It claims that result is 6.77561e+07 W/m2/sr. My site: 2.1447e+08 W/m2.

I don't know how to integrate. That isn't a homework for all. It's an extra exercise for me. I hope that you will help me with it. I do calculations in Mathematica. I put that: Integrate[((2*Pi*6.63*10^-34*(3*10^9)^2)/x^5)*(1/(E^(6.63*10^-34*3*10^9/x*1.38*10^-23*10000))-1)*1.256*10^-11...

Thanks. Problem is that I don't know how to calculate integrate.

Homework Statement I need to calculate radiation power of ball in range 400nm-800nm. T=10000K d=1um. Homework Equations I think I need to use Planck equation and integrate that. My equation in link: http://imgur.com/XbAUwJ8 The Attempt at a Solution I look for equations and laws and try to do...

I can use: tape, laser (unpolarized), white carton, plasticine, ruler, measuring tape, scissors. And only these. Has someone another idea?

You aim the laser on the cutted edge? So in your opinion it is impossible in this conditions?

I asked my teacher and I can use only white carton. Can you paint it?

I can put the tape on white carton.

The tape and air. I can't use any others media except plastic of cm ruler.

These: the light is in the more dense medium and approaching the less dense medium. the angle of incidence is greater than the so-called critical angle.

Yes, I saw that. But there is no that angle

I try to measure this angle, but for each angle (0-90deg) there is still a reflected and passing-through beam.

So I can measure this angle. Thanks. But it will be very small?

It can only follow the bonduary of medium if angle is critical angle