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Results tagged with light
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user 21222
For questions concerning electromagnetic radiation in the visible spectrum.
2
votes
What wavelength light is most effective?
I agree with Mathaddict for people naked or wearing regular clothes, however the metallic armor might reflect some of the MW radiation.
Use gamma rays, those will go better through armor. It also adds …
- 142k
1
vote
Reasons an alien would need protective eyewear
It's not that it is protective. Their atmosphere being different from wherever they go, the "air" will necessarily have a different refraction index. Regular glasses won't help, much for the same reas …
- 142k
3
votes
Could life as we know it exist if there were no speed limit and no special-relativistic effe...
Remember $E = mc^2$? Einstein originally wrote it another way:
$$ m = \frac{E^2}{c^2} $$
Which is the same, but makes it easier to drive the point: mass and energy are just two different measures of t …
- 142k
6
votes
Creating Darkness
If you make the smoke black, it will absorb visible light in all wavelengths. If you use vantablack, your absortion efficiency goes all the way to 99.96%. …
- 142k
2
votes
Trap light in a cage
No, because light moves at the speed of light. That means it can cover the circumference of Eart multiple times in a second. You will let all the light out before you can close the lid. …
- 142k
4
votes
How much light is too much?
Projecting light is itself a physical effect. … The effects visible light has on things, besides making them visible to us, depend on the target. …
- 142k
7
votes
What does the view outside my ship traveling at light speed look like?
For even just a light second, she is going to collect an awful lot of radiation. Even if you filter X-rays, UV... … There is still much more in a light second trip than what you would get from a strong laser pointer. …
- 142k
1
vote
Rural broomstick navigation on a moonless night
The witches may not always personally know the route well, but they can produce their own maps if needed.
This is all those ladies need, really.
It should take a lot of gall, daring and stupidity to …
- 142k
2
votes
Bioluminescence due to photosynthesis
Perhaps it coevolved with a pollinator that only comes out at night, and which is attracted by light. …
- 142k
11
votes
Animals with fur that fluoresces under UV, and a star with high UV levels--how dramatic is t...
You'd still get a lot of visible light, so it's more like having very powerful black light lamps everywhere. …
- 142k
3
votes
Plausibility of a cosmic flashbulb
NGC 5907 is about 50 million light years away from Earth. For comparison, M87 is 53 million light years away. …
- 142k
2
votes
Mechanism to slow down the light emitted by an object such that it will result in inaccurate...
The speed of light in any medium is fixed. Also, when light moves from a medium to a other medium, the bigger its difference in speed among media, the more it bends. This is called refraction. … Unfortunately for S he will probably go bankrupt building such a lens, specially when it shatters due to shotgun shells refracting differently than light in it. …
- 142k
1
vote
How can the interior of temple lit automatically during medieval time?
It also exhibits phosphorescence due to impurities on illumination with blue or ultraviolet light.
The temple insided will start glowing the moment they stop receiving natural sunlight. … Complement question is how to save energy by automatically turning off the light when the room is unoccupied?
With medieval technology? I don't think that's possible. …
- 142k
0
votes
How could there be a horizon on a flat earth?
You can't see very far in water because light does not go very far into it. That's because it is more opaque than air. …
- 142k
0
votes
How to explain day is 10 times as bright but no warmer?
Therefore they perceive the world more brightly, but no extra light is actually being sent to Earth.
About why only by day... …
- 142k