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Pic Thread #9

quixef

Son yazan: quixef
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Norak Grand Master

Norak

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It's called Cherenkov radiation, which is caused by electrically charged particles which travel through the water at a higher speed than light travels through water. Matter can move faster than light in a medium like water, because light propagating through a medium interacts with it and effectively moves at a lower speed than the speed of light.

What am I talking about? A simple analogy is this: if you try to walk over the bottom of a swimming pool full of water, you're moving slower than you would have in an empty pool. The same is essentially true for light, the presence of water makes it move more slowly. You've probably seen an effect of this lower speed of light in a medium: different colors move at different speeds, which is the reason why a prism separates white light into its constituent colors.

Okay, so the particle moves quickly. Why does it emit light?
As I said, the electric particle affects its surroundings. If the particle travels slowly, the water molecules move quickly enough to keep up with the changes caused by the particle, and they do so without losing much energy. When we increase the particle's speed, the water can't keep up and literally a shockwave of light is generated. You might know that when a jet flies faster than the speed of sound, it will create a sonic boom. This is basically the same effect, but for light instead of sound!

Okay, cool. But why is it blue, and not yellowish-red or white like most light sources I know?
The color of light depends on how it's emitted. Sodium lamps, for example, emit light that's mostly one color; the sun and lightbulbs emit light of many colors, the distribution of those colors depends on the temperature of the light-emitting object. For each of those ways to emit light you can predict what colors will be present and it's no different for Cherenkov radiation. The equation that tells us what colors to expect, the Frank-Tamm formula predicts that blue and ultravolet light are more intensely present than red light, so the radiation looks blue to us.
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Biyik Veteran

Biyik

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Akito said:

https://fbcdn-sphotos-f-a.akamaihd.net/hphotos-ak-xap1/t1.0-9/q83/p720x720/10491073_765122940176102_2037248415728239675_n.jpg
,

bu adam dini de bilmiyor.
kızların örtünmesi regl olmalarıyla başlar.
ortalama 13-14 yaşında regli başlıyor desek kızların, nasıl kandıracaksın genç kız olmuş birini şekerle?
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Norak Grand Master

Norak

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diyelimki nukleer denizaltınız var ve okyanusun dibindeyken daga çarptı

http://upload.wikimedia.org/wikipedia/commons/thumb/5/54/US_Navy_050127-N-4658L-030_The_Los_Angeles-class_fast-attack_submarine_USS_San_Francisco_%28SSN_711%29_in_dry_dock_to_assess_damage_sustained_after_running_aground_approximately_350_miles_south_of_Guam_Jan._8%2C_2005.jpg/1280px-thumbnail.jpg
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http://upload.wikimedia.org/wikipedia/commons/7/7d/Damage_to_USS_San_FranciscoSSN-711_showing_bow_sonar.jpg
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