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admiral
Joined: 17 Sep 2005
Posts: 546
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 Posted: Sun Jan 22, 2006 4:16 am Post subject: |
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KHF, that's a good experiment. But are you sure that I will see nothing afterwards?
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pugachevV
Joined: 16 Jan 2003
Posts: 2295
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| Posted: Sun Jan 22, 2006 6:28 am Post subject: |
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| You see the difficulty, KHF? |
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KHF
Joined: 15 Dec 2005
Posts: 100
Location: ON, Canada
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| Posted: Sun Jan 22, 2006 7:16 am Post subject: |
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| admiral wrote: |
| KHF, that's a good experiment. But are you sure that I will see nothing afterwards? |
Theoretically, you should see nothing. In reality, chances are you will still see something, albeit pretty close to pure blackness. The reason is a *pure* blue light and a piece of *pure* red paper are hard to obtain. To obtain purity the blue light must have one single wavelength around 475nm while the reflected light from the red paper must be entirely around 650nm. Home made apparatus almost always fails that criteria. However, the effect is so prominant you don't need a laser to actually tell that there is a significant intensity drop for the blue light that has been reflected off the red object. So if you really are in for some fun and have the means to do so, simply measure the intensity of the reflected light. You will find there is almost no drop when you shine red light on red objects, but a sharp drop when blue light is used instead. |
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stellara
Joined: 02 Apr 2005
Posts: 583
Location: germany
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| Posted: Tue Jan 31, 2006 3:27 am Post subject: |
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hey, that's a nice tip! thanks, i'll try it, and if it's just for fun! 
greets
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admiral
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stellara
Joined: 02 Apr 2005
Posts: 583
Location: germany
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| Posted: Tue Jan 31, 2006 8:43 am Post subject: |
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| admiral wrote: |
Sun always sends out all colors of light, including the ultraviolet ones and the infrared ones.
The atmosphere can stop these ones outside of the range 400-760 nm from coming in. |
where did you get this from?!? 
of course the other wave lengths also come through the atmosphere! otherwise it would be horribly cold on eartn because infrared is thermal energy, it makes us feel warmth. and ultra violet comes through as well, because why should I put sunscreen on my skin in summer? because it protects me from the short wavelength like uva and uvb which can trigger cancer.
and you can't really say that the sun irradates all colours of light because a 'colour' is just what we see as coloured, and because invisible light also has a certain frequency (which is the colour), say rather it sends out all frequencies instead of all colour.
greets
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admiral
Joined: 17 Sep 2005
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| Posted: Tue Jan 31, 2006 11:47 am Post subject: |
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I think that's because of the heavy industry all around here
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stellara
Joined: 02 Apr 2005
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Location: germany
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| Posted: Wed Feb 01, 2006 12:39 am Post subject: |
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what, the sunscreen? no, there's definitely also to us invisible wavelength from the sun light coming through the atmosphere, infrared as well as ultraviolet, radio waves, mikrowaves and even x-rays. believe me! 
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admiral
Joined: 17 Sep 2005
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| Posted: Wed Feb 01, 2006 7:41 am Post subject: |
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that's illogical
If all the wavelenghs of the light come through, then you will get skin cancer, believe me.
According to the pollution of environment, the ability of the atmosphere to stop shorter waves gets weaker, so the danger of ultraviolet light will get higher and higher. That's why you should put on suncream.
The ozone is O3, it arises when UV-beams or tempests hit on oxygen O2 and make it into two O-atoms. O + O2 -> O3
And the ozon reflects UV-beams, otherwise you will die.
So, industry and hothouse gases produce carbon and hydrogen and so on as hothouse gases, so this gases go up and oxidize into carbon oxide. So the ozone O3 vanishes.
Cl + O3 -> ClO + O2
It isn't so because Christi wants you to suffer, it's because of heavy industry, that's why I said it. And it's true, believe me!
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If I say "I love you" to someone, then I also have to say "I love inside you everyone else. I love the whole world because of you. I also love myself inside you" |
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KHF
Joined: 15 Dec 2005
Posts: 100
Location: ON, Canada
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| Posted: Wed Feb 01, 2006 5:56 pm Post subject: |
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| admiral wrote: |
that's illogical
If all the wavelenghs of the light come through, then you will get skin cancer, believe me.
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Electromagnetic waves of a broad range of wavelengths do indeed penetrate the atmosphere. Take the radio waves from pulsars for example. Also the number of waves around you isn't the cause of skin cancer; intensity is. When the radiation damages the skin cells and ultimately leads to abnormal cell growth. To do that the radiation has to be fairly intense, which is why you should avoid high exposure at noon. |
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admiral
Joined: 17 Sep 2005
Posts: 546
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| Posted: Thu Feb 02, 2006 5:59 am Post subject: |
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Yes, because the ozone hole is becoming greater the chance of damage you get will be higher. I never said that there is no hole.
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KHF
Joined: 15 Dec 2005
Posts: 100
Location: ON, Canada
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| Posted: Thu Feb 02, 2006 6:16 am Post subject: |
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And I didn't even mention anything about ozone. 
You did, however, say this:
| Quote: |
If all the wavelenghs of the light come through, then you will get skin cancer, believe me. |
Which is what prompted my reply. |
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stellara
Joined: 02 Apr 2005
Posts: 583
Location: germany
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| Posted: Thu Feb 02, 2006 6:17 am Post subject: |
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like you said, it's weakened by the atmospheric ozone, but it's not totally blocked.
mostly it's UVA which can get through the atmosphere, but also small amounts of UVB and-C, which are much more dangerous to us. because of the ozone hole in the atmosphere also these dangerous waves can come down to us, that's also why you should put much more/stronger sunscreen on your skin if you're in australia e.g. than here.
| http://region.hagen.de/OZON/ozon_6.htm#612 wrote: |
Wie man in der Abbildung erkennen kann, erreichen im wesentlichen nur sichtbares Licht (visible light) und UV-A den Erdboden. F�r die Abschirmung des UV-B in ca. 20 bis 30 km H�he ist die Ozonschicht verantwortlich. Das UV-C, also die Strahlung mit Wellenl�ngen von weniger als 290 nm, wird haupts�chlich durch den atmosph�rischen Sauerstoff bei der Erzeugung des Ozons und teilweise auch durch das Ozon selbst absorbiert.
Translated: As you can see in the image below, mostly it's the visible light and the UV-A (long-wave UV) which can reach the earth. The atmospheric ozone in about 20-30 km elevation is responsible for shielding UV-B rays. UV-C which has a wave length shorter than 290 nanometres is mostly absorbed by the atmospheric oxygene (while producing ozone) and partly by the ozone itself. |
greets
ps: but like I said - and like you can see in the image above - the infrared light isn't totally blocked, too, that's because it's warm on earth. without our atmosphere it would be horribly hot when the sun shines and horribly cold if it doesn't.. *brrr*
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admiral
Joined: 17 Sep 2005
Posts: 546
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| Posted: Thu Feb 02, 2006 6:25 am Post subject: |
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And I didn't even mention anything about ozone.
You did, however, say this:
Quote:
If all the wavelenghs of the light come through, then you will get skin cancer, believe me.
Which is what prompted my reply. |
don't be cute
It's not difficult to read a sentence, is it?
| Quote: |
| If all the wavelenghs of the light come through, then you will get skin cancer, believe me. |
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stellara
Joined: 02 Apr 2005
Posts: 583
Location: germany
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| Posted: Thu Feb 02, 2006 6:29 am Post subject: |
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hey, i don't understand why you posted that...  khf just corrected you because it's not the numer of rays but the intensity, which is absolutely right!
sometimes i really don't understand you..
| KHF wrote: |
| Electromagnetic waves of a broad range of wavelengths do indeed penetrate the atmosphere. Take the radio waves from pulsars for example. Also the number of waves around you isn't the cause of skin cancer; intensity is. When the radiation damages the skin cells and ultimately leads to abnormal cell growth. To do that the radiation has to be fairly intense, which is why you should avoid high exposure at noon. |
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