All Questions
25
questions
-2
votes
2
answers
60
views
Time dilation query [closed]
In the light clocks, time ticks via the motion of light and since speed of light is constant therefore when the clock is in motion ,the photon has to cover a greater distance by the perspective of an ...
0
votes
6
answers
218
views
Speed of Light and Time [closed]
I'm an amateur and this is my first question here, I'm trying to formulate question about a general representation I have in mind after trying to grasp the idea of relativity and the concept of space-...
- 143
0
votes
0
answers
24
views
Does time slow down for light according to relativity? [duplicate]
According to Einstein's theory of relativity
Time slows for a individual who moves at the speed of light and time goes backward if the individual is faster than the speed of light.
So , is it that for ...
- 725
-3
votes
1
answer
83
views
Can you experience multiple points in time at a specific point in time? [closed]
So from my understanding, light takes time to travel to our eyes. So everything we see is from the past, right? So does that mean that at a specific point in time, we are seeing simultaneously a point ...
- 13
1
vote
1
answer
80
views
Why is the time part of the space-time with exactly second degree?
Why is exactly $n = 2$ in the equation
$$\begin{array}{*{20}{c}}
{{{\left( {ds} \right)}^n} = {{\left( {c \cdot dt} \right)}^n} - {{\left( {dr} \right)}^n}}\\
{dr = \sqrt {{{\left( {dx} \right)}^2} + {...
- 201
2
votes
3
answers
174
views
Perception of light speed when traveling between two light sources
I'm struggling with a fundamental understanding of time dilation and special relativity (if I'm correct).
Many online sources explain it as the following:
With the ship moving away from the lightbeam ...
- 123
-3
votes
2
answers
168
views
How speed of light is absolute/constant if time (denominator) is relative?
Speed is path / time.
How speed of light in vacuum can be always constant if denominator (time) is relative, its changing?
If speed of light must be constant then path must be changed as well?
- 613
2
votes
3
answers
603
views
Is time taken by light to travel any distance 0 or finite? [duplicate]
According to relativity, Light does not experience any time. So it must travel any distance in no time.
But, we know that light has finite speed $c$. So it should take finite time.
- 31
5
votes
1
answer
1k
views
How can we perceive light if light doesn't move through time? [duplicate]
From my understanding in space-time everything moves at the speed of light $c$ in some direction of this four dimensional space. Light itself moves only through space, so it doesn't move at all in ...
- 225
0
votes
1
answer
464
views
Can a frame of reference travel with the speed of light? [duplicate]
I read that nothing with mass can travel at the speed of light. Therefor one can not ask what happens when an observer in a car moves with the speed of light. But, is it possible for a frame of ...
- 131
10
votes
4
answers
2k
views
Is speed of light a ratio or a universal constant?
We use the speed of light to define the length of the meter, but we also use the speed of light to count the number of clicks on our clocks (because all the electromagnetic events on the smallest ...
1
vote
2
answers
1k
views
Is the magnitude of the four-velocity vector in spacetime arbitrary?
I know that the squared magnitude of the four-velocity vector is plus or minus $c^2$, but I’m a little confused on whether or not this vector has been normalised arbitrarily, since it is often claimed ...
- 2,123
2
votes
1
answer
99
views
Time is in absolute Motion Or Not? [duplicate]
I just want to know If Time is actually moving forward in one direction or is there anything in the universe for which the time is actually at rest despite the fact that it's actually moving forward ...
- 19
4
votes
5
answers
745
views
Is everything relative? Length and time?
Yesterday I woke up in the night after having a dream (after sleeping late watching a SciFi film on space). It had this:
Suppose you are told that the linear size of everything in the universe has ...
- 592
32
votes
7
answers
7k
views
Would there be no time in a universe with only light?
It is sometimes said, that if you stand still (in space), you travel through time at the speed of light. On the other side light never stands still, so it always only travels through space (at the ...
- 9,910