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회원가입없이 누구나 아무 아이디로 자유롭게 글을 올릴 수 있습니다.

By contrast, light coming from a regular incandescent light bulb covers the whole spectrum along with scatters all around the room. (Which is good, because could you illuminate an area which has a narrow beam of light?)
There are about a hundred several types of atoms in the entire universe, and they are generally always vibrating, moving, and rotating. Think of babies on sugar. When you add energy to the telltale atoms (even more sugar to the kids), they get excited and bounce everywhere in the place.
When the atoms relax back for their "normal" state, they emit a photon (a light particle). Think with the kids as coming down off their sugar high, and so they all collapse for the couch.
A laser controls the way energized atoms release photons. Imagine giving half the children sugar, and picture the way they would bounce all over the place (like light coming from a bulb)if it took effect. They can be very high-energy on the list of better half who were contently sitting down.
Now imagine those sugar kids jumping in unison (a focused laserlight). The sugar-kids are infectious, and pretty soon, your children around options joining in and sharing of their excited energy. This is the place where a laser charges the atoms in the gas medium.
Now create a cat-flap that lets out a small number of youngsters out at any given time, while the rest are bouncing around inside, charging up everyone. That cat-flap exit could be the laser beam exiting the laser. The atoms remaining inside laser bounce off mirrors as they charge the other up.
Before we start, you may need eye protection – tinted UV ski goggles are fantastic to utilize, just like large-framed sunglasses, but recognize that these methods of eye protection will not protect your vision coming from a direct beam. They are intended as a general safety precaution against laser beam scatter and spinning mirrors. (Yes, you may be wearing sunglasses inside dark!)
A very neat addition to the experiments below is often a fog machine. (Rent one from your local party supply store.) Turn it on, make sure you have good ventilation, darken the lights, and turn about the lasers with an outstanding laser experience!
A quick note about lasers: keychain lasers from your dollar store work all right with one of these projects. Do not utilize green lasers purchased in astronomy stores – they are too dangerous to the eyes.
Plastic Bottle Beam Fill up a plastic water or clean soda bottle with water and add a sprinkle of cornstarch. Turn around the lights and arrive the laser, aiming the beam from the bottle. Do the thing is that the main beam inside the bottle? Can you obtain the reflection beam and also the pass-through beam?
Light Bulb Laser In the dark, aim your laser at the frosted incandescent light bulb. The bulb will glow and also have several internal reflections! What other varieties of bulbs are very effective?
CDs Shine your beam over the surface of a vintage CD or DVD. Does it are better with a scratched or smoother surface? You should see between 5-13 reflections from the surface with the CD, based on in places you shine it and exactly how good your "seeing" conditions are.
Glass and Crystal Pass the laser through several cut-crystal objects such as wine glasses or clear glass vases. Is there a big difference between clear plastic or glass, smooth or multi-faceted? Try an ice cube, both frosted and wet.
Microscope Slides Shine the laserlight by having a flat bit of glass, such like a microscope slide or single-paned window. Can you obtain the pass-through beam and also a reflected beam?
If you have it, fill a clear tank with water, add a sprinkling of cornstarch, and hang the slide underwater. Shine the laser from the side wall with the slide and both beams will probably be visible.
Lenses If you have an old pair of eyeglasses, pop out the lenses and try either in the beam to find out the many effects. Try one lens, and then try two consistent with the other person to view if you'll be able to affect the beam.
Filters Paint a bit of cellophane or stiff clear plastic with nail polish (or use colored filers) to put inside the laser. You can make an instant diffraction grating simply by using a feather inside the beam.
If you've polarizer filters, use two. You can substitute two sunglass lenses – no need to come out the lenses – you can don't use anything but two pairs of sunglasses. Just make sure they are polarized lenses (most UV sunglasses are). Place both lenses within the beam and rotate one 90 degrees. The lenses should block the light completely in one configuration and allow it to pass-with the other way.
Laser Maze Hot glue one 1" mosaic mirror (bought at most craft stores) to each wooden cube. In a pinch, you are able to use aluminum foil or Mylar. Add a fog source, such being a fog machine, dry ice, or clap two (very chalky) chalkboard erasers together – be sure that you have proper ventilation, as you will likewise require the area to be very dark. Turn around the laser adjust the cubes to aim the beam on top of the next mirror.
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As a tutor, engineer and university instructor Aurora Lipper may be helping kids learn science for upwards of ten years.
Want More Cool Science Activities?
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» The Word "LASER" Stands For Light Amplification By Stimulated Emission Of Radiation. A Laser Can Be An Optical Light That Emits A Concentrated Beam Of Photons. Lasers Are Often Monochromatic - The Sunlight That Shoots Out Is Often One Wavelength And Inspiring Experiments 2015-01-04 1178