Hey, what could be the speed of light if it's emited in direction opposite of what subject is moving with spee
340667
Again, the speed of light is a constant!  It does not increase in speed of the flashlight is moving really fast.  Its' like sound, sound goes 700mph in air at sea level.  If the plane goes faster than that it catches the sound, the sound doesn't go faster in front of the plane.  Same with light. Same with the opposite direction.
30733
If you were traveling at the speed of light, whether or not your lights work would probably be the least of your concerns.\n\nIn reality, the laws of physics prevent any object from traveling faster than the speed of light.\n\nSomething that is perhaps just as interesting, however, is what happens as your vehicle APPROACHES the speed of light.  Take a look at some of the work done by Einstein to get a general idea on that.
412765
1m/s physically you are walking towards a stationary object that is reflecing your image, as such you are walking towards it at the steady 1m/s.\n\nIf not that then you are both approaching a common point at 1 m/s so you combine your velocities to get 2 m/s.  but that's semantic bullcrap\n\nYou could get really technical and add in the fact that the photons are travelling back at you at the speed of light but that's just stupid.
1149311
Light does not intend to travel at the speed of light\nLight travels at a certain speed, it actually does not know its speed.\nWhen scientists measured this speed they found it 299 792 458 m / s or about 186000 miles per second \nso they make it fixed term, refereed as "the speed of light", used it in other physical equations...\nthen it "speed of light" became a famous term. \nBut Light still does not know that they called its velocity as the light speed..\nAnd I think it will not know!
495659
The accurate speed of light is 299,792,458 m/s.
406703
the speed of light is c=3*10 at the 8-th power  m/s\ndark means 0 light
586237
It's the exact opposite of the speed of light.
228021
Some people would argue the logic of a space craft having headlights at all, others might find fault in the fact that, physically, nothing with mass can ever travel at the speed of light.  But lets put that aside.\n\nThe speed of light is constant in any frame of reference, no matter who is "watching" it, it always travels with respect to them at the speed of light (c).\n\nIf you are in a space ship already traveling at the speed of light [with respect to some outside observer], when you turn on the headlights, the light will move away from you at the speed of light.\nIf some outside observer (who you are flying past at the speed of light) watches all this, they would, too, see the light travel at c with respect to them.  But since you and the light are traveling both at the speed of light with respect to the observer, you and the light would be keeping up with eachother.
70170
When someone answers this, I hope they can explain the Doppler effect if they backup Einstein's theory that light maintains a constant speed.
591948
c2 is the speed of light squared, which is about 186, 355 mph. It is a really huge number.\nIf you want to know a little more about the equation:\nUse a remote control for an example as mass.\n\nif you multiply the mass of the remote control (the amount of matter in the remote control) and the speed of light squared, then the resulting answer, which is energy or e, will have a huge amount of energy relased. It could even be more powerful than an atomic bomb or hydrogen bomb.
52144
Here are the postulates:\n\n(1) The laws of physics are the same as viewed from the perspective of any observer moving at a constant speed.\n(2) The value of the speed of light (denoted "c") is the same in every reference frame.\n\nThe first condition isn't very strange: You'd expect physics to be the same if you were on a very smoothly moving train as you would if you were standing on the Earth.\n\nThe second condition is very strange: Suppose you have two people moving with respect to each other.  One of them is moving at 1/2 the speed of light and the other is moving at 1/4th the speed of light.  Now, a beam of light is passing by them.  They'll both measure the speed of that beam RELATIVE TO THEIR VELOCITY to be c.  \n\nNote that this is a big contrast between what we'd normally expect.  Suppose you were moving at 7 miles per hour and I threw a ball past you at 10 miles per hour.  You'd see the ball moving away from you (another way of saying "moving relative to you" at 3 miles/hour because 10 mph - 7 mph = 3 mph).\n\nIn our light example we just saw that both observers measure the velocity of light relative to their own velocity to be the same.  It'd be like if your friend was moving at 5 miles per hour and you were moving at 3 miles per hour and you both claimed the ball was moving away from you at the same rate.\n\nAt any rate, what this is meaning is that neither time nor space is an absolute quantity.  If you were to observe a rocketship moving near the speed of light (as measured with respect to you), you would observe:\n\n(a) That the rocket appears to contract (shrink) in it's direction of motion, and\n(b) Events aboard the spaceship would appear to occur more slowly.\n\nHowever, they would measure the same things happening to you and the events along the spaceship to be proceeding normally.\n\nThat is only a very brief introduction.  If you'd like a better, but still accessable to a non-scientist, account of this I suggest you consider reading http://casa.colorado.edu/~ajsh/sr/sr.shtml .
506771
Actually by what Einstein explained, da light will still be in  front of da car, it won't go behind u no matter how fast u r going even if u r faster dan da speed of light. Weird? rit. I too thought so, It was explained in discovery channel. Well I'll try 2 explain it 2 u, But it wud hav been easier if I cud actually show it by som animations. When u r travellin at da speed of light, time stops. Ya it does. Time is somthin like per user setting, it is unique for u & each & every one. Think dat ur carrying an Einstein's clock, which is a simple devise with 2 mirrors facing each other with a photon bouncin of the mirror. Each time it bounces from a mirror u'll hear a tic sound, that will b 1 second for u. Say u travel at a speed little less dan light u r movin forward but da photon has 2 move a lot more distance than it initially had been, which was in a straight line, but now it's motion will b som what like a hypotenuse, so it has 2 travell more distance dependin on ur speed. So ur 1 sec will not be da same as 1 sec is for som 1 on earth. So actually ur headlight will be actually movin faster dan u no matter what
853481
einstein wondered what stuff would look like if he traveled the speed of light. One thing he wondered about is what would light look like.\n\nYou should know what a dopler shift is. When something is traveling away from you the wavelength of radiation emitted from that object increases in wavelength. If you look at the formula for calulating the shift in wavelength you see that the limit as we approach the speed of light is that the wave becomes flat (there is no wave). So we would see nothing.\n\nAlso the way the equation is set up, in conjunction with with fact that wavelength*frequency = speed of light, this also means that the frequency goes to infinity. This is because to travel at this speed is impossible. But you were wondering what the light would look like so the answer is the wavelength becomes zero and you see nothing.
1148279
light travels at 3 x 10^8 m/s\n\nsound travels at 330 mph \n\nso it takes lot of time for sound to reach us, than light..even though both are produced at the same time...
1162111
Yes it would, but it would have to be going at approx 12% the speed of light. It would be "blue shifted" the opposite of the redshifting associated with cosmological expansion
996962
The speed of light is a constant (186,000 mi per second) and does not change based on what it is travelling through.
970195
This is one of the oldest questions in the world, after Einstein came out with his special relativity.  The answer is that no matter how fast you are going, your headlight beam is STILL shining ahead at the speed of light. This is exactly what the equations say, and it works.  If it wasn't true, then all the giant particle smashers in the world costing billions of dollars wouldn't even work.