Can a Light Spot Go Faster than c?

Thread starter Dr Lots-o'watts
Start date Jul 31, 2010
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Light Speed

In summary, according to Einstein's theory of relativity, the speed of light (c) is the maximum speed at which any physical object can travel. It is physically impossible for any object to accelerate to a speed faster than c, as its mass would increase and require more energy to accelerate. This principle also applies to light, as the speed of light in a vacuum is a fundamental constant that cannot be exceeded. If something were to travel faster than c, it would violate the laws of physics and have major consequences for our understanding of the universe.

Jul 31, 2010

Dr Lots-o'watts

Please remind me, the red dot caused by a laser pointer, can it go faster than c?

It's neither matter, nor light, it's a series of distinct reflections, so with a quick flick of my wrist here on earth, that spot could zip across the moon faster than c right?

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Jul 31, 2010

mgb_phys

Science Advisor

Homework Helper

Yes it can - there is no information moving, so no problem

1. Can a light spot actually go faster than the speed of light (c)?

No, according to Einstein's theory of relativity, the speed of light (c) is the maximum speed at which any physical object can travel.

2. What if a light spot is accelerated to a speed faster than c?

This is physically impossible, as no object can accelerate to a speed faster than c. As an object approaches the speed of light, its mass increases and requires more energy to accelerate, making it impossible to reach or exceed the speed of light.

3. Is it possible for light to travel faster than c in a vacuum?

No, the speed of light in a vacuum is a fundamental constant and cannot be exceeded. This is a fundamental principle of physics and has been repeatedly confirmed through experiments.

4. Can anything travel faster than c?

No, as mentioned before, the speed of light is the maximum speed at which any physical object can travel. This applies not only to light, but to all forms of matter and energy.

5. What are the consequences if something does travel faster than c?

If something were to travel faster than c, it would violate the laws of physics as we currently understand them. This would have major implications for our understanding of the universe and could potentially lead to a complete overhaul of our current theories.