If you're in a rocket going the speed of light, what happens when you turn on the headlights?
437251
Its very sensitive question.., And i ll explain u very easy way...hmm...for light time of travellin is in fractions. though we assume the rocket is travellin in velocity of light, for that particular time light takes rocket is in static(0 speed) and travels to is own speed..and travels faster than de rocket. Assume this way.., u have already switched on de light before the rocket starts...and slowly tends to reach the velocity of it own head light, will u think the velocity of head light will go down....?? no , absolutely not...it travels as always with respect to treating rocket is in static(0 velocity)..
1090971
Physics. Tasty, tasty physics.\n\nIt occours for the same reason a car rushing by you seems to change sound. To a stationary observer, the frequency (pitch) of the soundwaves made by the car as it drives away will decrease, so the pitch in your ear gets lower and lower as the car gets further and further from your location.\n\nSounds waves and light waves work much the same way - I used the car example to help with visualization. :3 It's all the Doppler Effect in action.\n\nSo, to answer your questions...\n\nIf space itself were not expanding, but galazies were moving away from each other, yes, redshift would still occour, since it's the light sources that matter, not the size of what they're contained in. If the stars are moving away, you will experience redshift looking at them.\n\nLight does indeed travel at a constant speed, but you've got the second part wrong. Yes, the energy, wavelength, and frequency changes. But all waves in a single medium (IE space) will have the same speed.\n\nTake a look at the equation v = lamba (f), which in words is velocity of the wave equals the wavelength times the frequency. If the wavelength doubles, frequency will halve, and velocity remains the same.
712928
if a cow laughs does milk come out of its nose     or what if traveling  at the speed of light will your headlights work
977539
On the contrary, a light beam would merely percieve that it travelled instantly inbetween origin and destination. Space would be warped to Zero distance in the direction of travel, not Zero space. I know it seems like a sleight-of-hand trick with the mathematics, but the distinction is important.
33169
IF YOU WERE GOING AT THE SPEED OF A BULLET,YOU WOULD BE RIGHT NEXT TO IT AT SPEED O. THE SAME WITH LIGHT, IF YOU WERE GOING THE SPEED OF LIGHT IN YOUR CAR (LET'S SAY )YOU WOULD SEE THE LIGHT ON,BUT TO SEE THE LIGHT OFF YOU MUST BE GOING FASTER THAN THE SPEED OF LIGHT.SO THEN YOU SEE THE LIGHT ON AT THE SAME SPEED THE CAR IS GOING.
319610
Asking such questions shows that you are of an outstanding nature and an inquisical individual. This question has llong been the subject of discusion ever since albert einstein's theory of relativity in 1905, and later quantum in 1934. It has commonly been accepted that since you would never be able to lravle at the speed of light, it is pointless to speculate. However, it is possibly to say theoretically that switching the headlights on whilst travelling at the speed of light would cause you to see nothing but blackness, or no change from the surroundings, since the strings have the smae frequency and you cannot pass through them since they have already passed. Trusting this is of measurable help, yours brightly, jgdyrh
676715
The speed of light is the upper limit of speed in our space-time universe. Nothing here can be faster. And no car or any other macroscopic object can be equal to the speed of light. But the question is a thought experiment, hence, a good one indeed. Questions like this were raised by Einstein and Relativity became part of modern physical theory.\n\nSince the speed of light is an upper limit, the light from the headlamp of the relativistic car cannot be faster than the car. You won't see them in front.
938852
The driver cannot see the lighting of the lights on the road as teh car will be travelling at the same speed of light. The car will be on the same point of the road where the light is falling. Because the car will travel that distance along with light which is about to hit the road. let me explain. Let us assume that car is "c" lights are "l" and the lighting is "r". So their positions will be some thing like this\n     c   lr\nAs lights will be before car.\nNow lights have released the light and the light is hits the ground and at teh same time car reaches that point.\n           cr   lr1\nr1 is the light that is released at that point of instant.\nI had explained a lot and in that effort I had missed the point that this cannot be explained like this. LOL.
883279
light has constant speed... a big zero acceleration....\nlight does not have mass so no inertia... but amazingly has momentum...........
592518
This question comes up very regularly. If you do a search you will find it has been answered dozens of times in the past few months.\n\nIgnore what the previous poster said, he is completely incorrect. The speed of light is an absolute constant. It doesn't matter what speed you are travelling at the light will always be travelling away from you at the same speed: the speed of light.\n\nThe freaky part is that the light from your headlights would seem to be travelling away form you at the speed of light (C), but to an observer who was sitting still the light would also appears to be travelling away from them at the speed of light.  How can that happen? Well it's one of the tricky bits of relativity, but part of the solution lies in understanding that although light never slows down or speeds up relative to any observer it does change frequency.\n\nSo to you the light from your headlights will look quite normal, but to someone sitting still your headlights will appear to be emitting x-rays. The light would be invisible to them.\n\nThe corrolary of that is that any light approaching your windshield will be equally shifted into the x-ray part of the spectrum. Although the headlights will be emitting visible light, any time they strike an object and reflect back they will reflect back extremely low frequency light that is invisible to the human eye.\n\n\nSo no, it won't do a damn bit o good to turn on your headlights. That's not because the light won't travel, it will travel just fine. The problem will be that any light that  reflects back off the road will be invisible to the human eye.
293728
At the speed of light you gain infinite mass so the light beam from a headlight must go faster than light to escape the headlight it's self.If the beam could be a higher energy of light like gamma rays and if you could see a gamma ray which human eyes can't then maybe you'd see something. The question is will they come on,yes because\nthe electricity will flow through the filament of the bulb so it's on but can you tell by eye?No,because it would take forever for the light to reach your eye at equal speeds.
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
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.
44895
Interesting quatum phenomenon question.  The lights would come on, but they might appear strange to an observer due to the Doppler effect.  You, inside the car, would continue to see a headlight 'beam' because light's speed is a universal constant and not dependent on the speed of the source.  However, traveling beyond the speed of light in conventional space is not possible, to our knowledge.  For one, it would require infinate energy.  It would also cause macro-scale collapses in casaulity (effects happening before the cause).  To date, these bizzare effects have only been seen on quantum scales.
1065439
The speed of light - it can't go any faster!\nThere will be a distortion however, called blue shift.\nThe perceived (by a stationary observer) frequency of the light would increase, and the wavelength would decrease, so that the velocity is constant v=fλ\nThe distortion would be infinitesimal 30 parts in 186000*60*60.\n\nSound would experience a similar distortion, so that if a vehicle sounds its horn as it drives past, there is a perceived frequency change in the sound.  This is called the Doppler Effect - there is a link at the bottom of the blue shift link... (see also red shift)
1116675
Ha\n\nInteresting speculation \n\n1. The light will not change color no matter how fast you go. Only in your perception it will, so unless the law enforcement is traveling within your frame of reference you would be found guilty anyway.\n2. True, if you are moving towards the light its frequency will increase towards the blue and will appear green to you, but the acceleration would kill you.  \n3. If you could travel with speed of light why would you care about traffic lights?\n\nGood question anyway.
647799
You can't go at the speed of light. It's a theorical limit, so it's unreacheable. Only the light can reach it.\n\nIf C is the speed of light, the fastest you can get is C*0.999999999... (insert as many '9' as you want). When you turn on the headlights, they will be somewhat faster: they'll reach the speed of light.