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Originally posted by dbates
I believe that if you had a room made up of perfectly aligned mirrors then you could have a light beam bouncing around in there forever. The problem lies in the fact that we can't make perfect mirrors that reflect 100% of the light. Some of the energy from the light is transferred into the mirror each time it bounces off it. So the effect would be a light beam that got weaker with each bounce.
Given the speed of light I'm sure you realize how many times it could bounce back and forth in closed room. So it would probably appear to disappear at the same instant the light source was turned off.
Actually excited atom are those which have absorbed photons with enough energy to kick one of its electrons to upper shell. If hitting radiation (photons) doesn't have enough energy to do that they're just absorbed and energy goes for increasing atom's vibration. (meaning object warms)
Originally posted by MrNice
Hold up a piece of metal to sunlight. The sunlight is blocked but the metal becomes hotter and hotter. The metal is hotter because the particles in the metal are more excited, they are vibrating more violently.
Originally posted by E_T
Actually excited atom are those which have absorbed photons with enough energy to kick one of its electrons to upper shell. If hitting radiation (photons) doesn't have enough energy to do that they're just absorbed and energy goes for increasing atom's vibration. (meaning object warms)
Originally posted by MrNice
Hold up a piece of metal to sunlight. The sunlight is blocked but the metal becomes hotter and hotter. The metal is hotter because the particles in the metal are more excited, they are vibrating more violently.
en.wikipedia.org...
PS. Sonar is used underwater and uses soundwaves unlike radar which uses electromagnetic radiation.
Originally posted by bet555
There are now airplanes that when sonar hits them they absorb the sonar, Hence making the play appear to not be there on the radar. If we can make an airplane appear to not be there while flying at supersonic speeds. Then why can't we figure out a way to control sun light
Hmmm ... sounds simple enough. Hmmm ... Earth services , star, moons, asteroids, they all seem to bounce light off of them when the sun is shining on them ... How ??? What makes them so differnt or is it just that we can see it because the world behind the star or whatever is so dark.