|  |  | The paper, for example, is not perfectly flat but has a roughness on some length scale as shown in the picture. Some parts of it thus are always reflecting the light into your eye.
|  |  | Condensed water vapor means you have small water droplets (it they're too big they fall down and we call it rain) in the atmosphers; milk means you have some emulgated grease particles in the water.
|  |  | Light is scattered at those small things in all directions and the scattering of light is one topic we encounter if we look at not-so-perfect materials
|  |  | Since "small"and "large"are relative values we must use the obvious natural length scale when dealing with light as our ruler and that is of course the wave length l » 1 µm. We then distinguish three cases depending on the length scale lmat inherent to our material
|  |  | lmat << l. The extreme would be scattering at single atoms or molecules but proper nanoparticles also belong into this group. This kind of scattering is called Rayleigh scattering. lmat >>l. No probel, we cpovered that already. Just look at any part by itself and apply what we discussed before. lmat » l. Mow we have a problem. What will happen in this case is difficult to deal with and no general rules apply. This kind of scattering is called Mie scattering

Spezialzeichen |  |
£ | kleiner gleich | Þ | Doppelpfeil rechts
³ | größer gleich | Û | Doppeldoppelpfeil
» | ungefähr | Ñ | Napla
¹ | ungleich | Ü | Doppelpfeil links
µ | proportional | Þ Ü | Beide Pfeile
v2 ó õ v1 | Integral von v1 - v2 | ® | Einfachpfeil rechts
v2 S v1 | Summe |  |
æ < è |  |  |
æ ç è ö ÷ ø | beide Klammern |  |
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Spezialzeichen |  |
£ | kleiner gleich | Þ | Doppelpfeil rechts
³ | größer gleich | Û | Doppeldoppelpfeil
» | ungefähr | Ñ | Napla
¹ | ungleich | Ü | Doppelpfeil links
µ | proportional | Þ Ü | Beide Pfeile
v2 ó õ v1 | Integral von v1 - v2 | ® | Einfachpfeil rechts
v2 S v1 | Summe |  |
æ < è |  |  |
æ ç è ö ÷ ø | beide Klammern |  |
÷ ÷ | langer Strich |  |
Rest | ¡¿¢£¤¥¶§©®™ ªº«»<>‘’“”…–—µƒ°·×÷±¹²³¼¾¦ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑ ¡¿¢£¤¥¶§© ®™ªº«»<>‘’“”…–—µƒ°·×÷±¹²³¼¾¦ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑ
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# 2. Energy

## 2.1 What We Need

### 2.1.1

The

The

s = |q| · n · µ
[r] | = | Wm |
--- | --- | --- | ---
[s] | = | (Wm)–1 | = S/m

Some Values and Comments

Metal | Ag | Cu | Au | Al | Na | Zn | Ni | Fe | Sn | Pb | Hg
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
r [m Wcm] | 1,6 | 1,7 | 2,2 | 2,7 | 4,2 | 5,9 | 6,8 | 9,7 | 12 | 21 | 97
s = 1/r [106 · W–1cm–1] | 0.625 | 0.588 | 0,455 | 0.37 | 0.238 | 0.169 | 0.147 | 0.103 | 0.083 | 0.046 | 0.01
s = 1/r [106 · W–1m–1] | 62,5 | 58.8 | 45.5 | 37 | 23.8 | 16.9 | 14.7 | 10.3 | 8.3 | 4.6 | 1
Questionaire
Multiple Choice Fragen zu 2.1.1

© H. Föll

© H. Föll