I know it has something to do with light but can you guys be very specific because I am on a science review for my final exam and this has to be accurate.
199448
Nature is all about entropy or conservation of energy.  Stars of which Our Sun is one start their life as large balls of Hydrogen gas.  Due to the friction of the untold number of molecules  moving about, heat is developed- just like rubbing Your hands together.  The inside temperature of the Sun is about 2 million degrees.  It takes more energy to maintain 4 atoms of hydrogen than it does for one Helium.  With all the heat in the star's core it is possible for the hydrogens to form a helium by the process of nuclear fusion.  6 hydrogens take part in the reaction but two are recovered so the net result is 4h>1He.  This reaction results in the saving of 0.6% energy which works its way to the surface and radiates out into space.  Within the Sun it is estimated that about 745,000 tons of H are converted every second.  This number varies a bit when one reads the literature, but whatever the actual number is it is huge.
10489
Regular light. It is not a lazer or any special kind of light, just "light". It is probably generated by a specialized piece of equipment, but it is just light - photons. It probably doesn't contain ultra violet light like sunlight, it is probably closer to artificially created light like that from a lightbulb.
521463
I believe the light bulb would light up the sphere, like a lamp shade, You'd see the light but not the light bulb. The metal particles that are in a one sided mirror allow some light to come through.
3202
Unless the reflective surface is perfect (which is impossible in the real world) the light will loose a little energy with each reflection (the mirror will heat up a little), and in a very short time the light will just get redder until it is merged into whatever infrared energy is inside the sphere.
518993
A lot.  Only 1% or less of the light actually makes the image.  This is why digital photography is so much better when it comes to astronomy.
143431
Hi there,\n\nTemperature vs colour goes red, orange, yellow, green, blue, violet. It is simply the spectrum of light (think rainbow) because that is what it is based on.\n\nSo red light is actually the coolest, and as you go up the temperature scale, you run through the spectrum to violet.\n\nWhite light is a combination of ALL the different colours of light, so something which glows white hot is just releasing all different levels of energy, so it appears white. So in actual fact, blue (or more accurately violet) is hotter, because if something is blue hot, then it is releasing ALL really high levels of energy, but you rarely get anything which is completely blue hot - there is almost always some sort of mixture, and usually, the object glows white tinged with blue (which just means that the object is releasing all different levels of energy, but predominantly or mostly blue!)\n\nJust for your interest, the way this works is, when you heat something up, you are exposing it to invisible energy called "infra red" which is just heat. So when you touch something and it feels hot, you are simply sensing infra red energy!\nThis energy is "weaker" than light (so light is actually more energetic than heat), but if you let an object get hot enough, it stops being able to release the heat as just infra red and starts to release it as visible light. The hotter the object gets, the further along the spectrum is the light emitted.\nActually, if the object absorbs enough energy it will start to release Ultra Violet (UV) and X-Rays!
193542
Although they are part of the same phenomenon, heat and light are at different wavelengths; Imagine a Rainbow going from Red to Blue, the radiation wavelengths behave in a similar way, thus, the heat from the Sun is derived from the "red" end of the spectrum, the Light from the Blue end all travelling together at the same velocity.
54860
No it is not. \nVelocity of Light is constant.
143806
You have to remember these are descriptions based on experiments. Light can act as both- as do other particles. Keep in mind that the map is not the territory.....
519024
Something involving atomic spectra.  For example see\nhttp://www.fas.harvard.edu/~scdiroff/lds/QuantumRelativity/StreetLampSpectra/StreetLampSpectra.html
352207
Here's a nice explanation:\nhttp://www.4to40.com/QA/index.asp?counter=382&category=science
354932
Light is measured in 2 ways with respect to plants.\nOne is lumens. That's the brightness. The other is \ncalled color temperature which is measured in Kelvins.\nThat is the light frequency which is to you, the color. Sunlight\nis white light which is made up of the whole spectrum(i.e., all\nthe colors of the rainbow). Normal house light is largely the\nlower frequency light and relatively low in lumens. Plants\nthat, in the wild, grow at forest bottom under the shade of many\ntrees find indoor home light quite adequate.  But plants that ,\nin the wild get direct sunlight, need that and don't get enough light\nin a house.
488552
hello!\n\nTo find your answer look up "The Photoelectric Effect"\n\nThis will answer your question.  Its better than me giving you the answer cos you'll be better clued up.\n\nwikipedia will do
185456
Or did you mean when light hits an object, rather than lightning?\n\nIn this case, it really depends on the composition of the object and the wavelength of the light.  Generally, some of the light is absorbed into the object in the form of energy, and some of it is reflected back.  For example, a white light shone onto a red postbox will absorb every colour within the white light except for the red wavelengths which will reflect and be seen, hence it appearing red.
32719
The problem is, the air refracts the light as the sun rises. When you see the sun as it rises, it is still actually below the horizon, and it is just that the layers of air are bending the light down so you can see it. The color that gets bent (refracted) the most is the violet light, then the blue, then the green and so on. That is what is responsible for the green flash (since your eye is not as sensitive to the blue and the violet colors, it sees green first). The red actually arrives last, because of these refraction effects. \n\nThe speed of light difference between red and violet is extremely small in air, so this should not have a large influence in the timing, particularly when the atmosphere is only a few tens of miles thick at most (99% of the atmosphere is in the lowest 30 Km).\n\nAfter thinking about this a minute, I realized that you are asking because the sun looks red when it first comes up. This is NOT because the red gets here first. The blue wavelengths are scattered away from the almost white sunlight by the nitrogen and oxygen in the air, leaving the red color. As the sun rises, it goes through less air, and less blue is scattered away, and the sun becomes orange. As the sun rises even higher in the sky, less blue is removed, so the sun looks yellow.
51509
It means everything needs to be identical, except for what you are testing.\n\nFor example, if you are testing to see if light is needed to grow plants, you would have 3 identical sets of plants, in the same temperature, humidity, soil, etc.  The only difference is that one would be in total darkness, one would get 12 hours of light/dark, and the last group would get 100% light.
523010
Since the light beam actually transfers momentum to the reflector, I believe you can "consider" that the photons have slowed down and reversed direction.  But that is not what "really"  happens.  The time it takes for 10m in one direction and two 5m paths is the same, as the velocities are identical in both directions.  The momentum of a photon is not related to its velocity (as it is in physical objects); it is a function of its wavelength only.