how are light and sound alike?and how are they different?
607786
Both are waves. Both have an associated frequency, amplitude, wavelength etc.\n\nSound travels in a medium (air for example) and is made up of compression and rarefaction waves.\n\nLight doesn't travel in a medium (it can travel through a vacuum) and is made up of the fundamental particles photons.
104195
They sound the same to me!
923435
light travels as fast as it always travels, no matter what it shines through. Things block light, but it doesn't slow it down.
279774
Light and sound both travel through waves, though light travels fatser than sound. Light does not require any medium for transport, so it is called an electromagnetic wave. Sound however needs a medium as it is transmitted through the vibrations of the particles of the medium. It is called a mechanical wave.
102078
Yes there is sound. Don't confuse sound with 'hearing'. The speed of sound is given in ft/sec, varying with what it moves through.. There is no factor there for 'hearing'. If you turn on a flashlight at night and a beam is created, but there is no one there to 'see' it, light is still emitted; the beam is certainly there. It's the same for sound. Sound is a compresson/rarifraction wave moving through a medium. The wave is there, detected or not. Or take the case of radio electromagnetic waves. The wave is certainly propagated, even if no radios are turned on.
386222
sound is particles vibrating in succesion. waves. \nthere are more particles in iron so the sound is trasnfered faster.
548415
I have never heard of bells (bels ) being used to measure light, only sound.\n\nIf two sounds differ by 1 bel, one is 10 times as loud as the other.
773649
Yes. For example, there are materials in photoelectric sensors made with a form of silica used to convert "light signals" into electrical impulses; we use them everyday in devices we call photocells. They're what turn those outside lights on when it gets dark. Light to sound conversion, and vice versa,  can be accomplished with different materials and circuitry.
629963
Besides the obvious "that's just how the universe and nature is" reason, it might be because sound is the propogation of mechanical waves.  It needs things like air to travel through and disturb the molecules.  Light is just itself (in some wavelength form) and travels that quickly.
689994
Sound needs a physical medium (like air or water) to travel through, so if you're talking about sound traveling through space, that's a no-go.  Electromagnetic waves, yes - light, x-rays, gamma rays, and so on.  Sound waves, no.  As far as here on Earth, I don't think that would work either.  The intensity of the sound wave would diminish very rapidly - eventually the vibration would be smaller than an atom, and be lost in the craziness of the molecular world.\n\nHowever, some of the stars that we see are in fact millions of light years away.  So that light has been traveling for millions of years.
512696
My guess is you are talking about being able to see the flashing lights of a plane at night but cant hear it. Or seeing a high plane with contrails during the day but cant hear that either. Light travels 186,282 mps while sound is only 1100 feet per second. So you see something your mind knows is making noise, but cant hear it because of the distance. Now if the sound has not dispersed through the air by the time it gets to you, then you hear it, but since you cant see what is making it, you dont realize it.
985628
Roughly, light is like a wave you might see in the ocean except it's a bit different.  An ocean wave is energy in a mechanical form(in the form of motion here) that is travelling through water.  A light wave is energy travelling but in an electromagnetic field.  It's not quite right but you can think of it as an ocean wave travelling through an ocean of electromagnetic field instead of water as a rough approximation.\n\nJust like waves in water can be short or long, electromagnetic waves can also be short or long.  Why do you care? because you can see some electromagnetic waves that have a range of lengths (about 400 to 700 nanometers is the range).\n\nYour eye can tell the difference between shorter and longer waves and the experience in your brain is different based on the length.  How is it different? because the color you see is different.  Shorter wavelengths are violet and blue, longer ones are red and other colors are in between.\n\nThere's something else too.  What happens if you open your eyes are in a room with NO electromagnetic waves of any kind? you will see blackness.  Blackness is how your brain interprets the reception of no visible light on your eyes.  So when you see blackness it means that there is no visible light coming from that direction (there could be some that has a wavelength that is too short or long but your eye cannot see that).\n\nIt comes down to the fact that blackness is what you see in the absence of visible light so you can't make black light because blackness is not something associated with a type of light.  So if you want to say you can make black light then bring your friends into a room and tell them to look closely at a "special" bulb and then turn it off.
517188
It is possible to encode sound into light, send it through space, then decode it back into sound.  You can do this by using the amplitude modulation of light.  Basically, you make the light "wiggle" and it then has a pattern of the sound vibrations.  See my sources for complete details.  It also explains step by step how to build such an apparatus.
362504
Sound is a waveform passing through a medium (in this case air). Cooler night air is denser than warm daytime air and therefore easier to travel through and propagate. Other factors already mentioned contribute to it seeming louder, but do not help it to travel further.
869017
Sound waves can be heared but cannot be seen, only light and colors are seen. We can only see the motions, oscillations and vibrations on the objects caused by sound waves.♥\n\nCheck out these links:\nhttp://www.du.edu/~jcalvert/waves/soundwav.htm\nhttp://www.glenbrook.k12.il.us/gbssci/phys/Class/sound/u11l1a.html\nhttp://www.du.edu/~jcalvert/waves/soundwav.htm
134682
Light is both a wave and a particle at the same time.\n\nLight is a form of energy, and depending on how you observe it, it exibits both properties of an electromagnetic wave or a particle (photon).\n\nElectromagnetic waves do not require a medium in which to propigate, they are a self propigating electric and magnetic field, allowing it to travel through a vacuum.\nEvidence of this can been seen in diffraction patterns, such as when you look at the rainbow effect on a CD.\n\nPhotons are a "quantized" amount of light.  These light partciles are absorbed or given off by atoms in something called the "photoelectric effect" (which Einstien received a nobel prize for).\nEvidence for this can be seen in things like LEDs or when you study the structure of the atom.
1140623
maybe someone got shot right outside your window while it was raining.. perfect cover\n\nNo, really the different sounds are created by different frequencies and wavelentghs of the vibrations caused by the electricity splitting the air. This can vary from the sonic boom you hear when a F15 crosses Mach 1 .. to the crack noise you hear with a whip. As for the loudness, it is a function of intensity and proximity.. so yea the same lightning will be louder when its closer.. but it could also be a very strong lightning far away.. the way you could tell would be the difference in light and sound... \n\ni hope this helps