All Questions
Tagged with speed-of-light reference-frames
194
questions
2
votes
1
answer
161
views
When you are in a gravitational field, do object far away get physically closer to you as you get closer to the mass?
An observer A is close to a black hole and an observer B one light year away. They are both remaining at constant radial distance from the black hole. A is at 2 Rs away from the center of the black ...
- 171
3
votes
4
answers
835
views
Gravitational Time Dilation and the Apparent Speed of Light
It has been proven that time far away from Earth is faster than time on the surface of Earth, due to gravitational time dilation. (GPS satellites take gravitational time dilation to account.)
Would ...
- 141
7
votes
1
answer
3k
views
Why didn't Michelson and Morley assume or conclude that aether is homogenous and permeate all of space?
In the Michelson-Morley experiment, why didn't they assume or conclude that ether is homogeneous and permeate all of space instead of coming from an unspecified source or direction dubbed the ether ...
- 13k
0
votes
1
answer
47
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How to explain light traveling two distances in the same frame of reference? [closed]
Suppose I have a "moving" frame of reference where I send a light beam from point A to two equidistant points B and C (equidistant in the moving frame of reference). From a "stationary&...
0
votes
1
answer
59
views
Relativistic Effects on Electromagnetic Wave Propagation
So for a recent lab I had to calculate the length of a conductor by measuring the time it took a signal to reflect off of the open end. I used the very simple principle of $v=st$ and, knowing that the ...
- 1
9
votes
2
answers
477
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Speed of light postulate in special relativity in inertial vs. non-inertial frames
I'm trying to learn special relativity by myself. I've been following this series of videos, plus some other articles I've managed to find online. At this point I'm already quite far into the theory, ...
- 540
0
votes
3
answers
127
views
Relativity of bodies in motion in space
I have learnt that if we are travelling in space we have no way to tell if we are moving towards something or if it is the something that is moving towards us; to either object they judge that they ...
- 1
9
votes
8
answers
3k
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What would a privileged/preferred reference frame look like if it existed?
So I'm still reading up on Einstein's theory of special relativity and what it means in regards to space-time and motion.
One key feature and cornerstone being that there exists no such thing as a ...
- 209
0
votes
0
answers
29
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How would we perceive a pulse of light if we accelerated constantly in the same direction? [duplicate]
I'm watching this video (the link starts at the relevant timestamp) and am confused about one thing. Let's say I'm going at a constant speed of $0.99c$ in $+x$ direction (w.r.t Earth), and a pulse of ...
- 1,240
0
votes
2
answers
162
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Can the speed of light be measured only in a local inertial frame of reference?
Whether the speed of light can only be measured at the observer's place, in his local inertial frame of reference, that is, where the measurement is made. It is about the fact that the observer (that ...
- 201
14
votes
9
answers
5k
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What is the cause of the constancy of the speed of light in vacuum?
According to the general theory of relativity, every observer will measure the same speed of light $c$ in vacuum, if they measure in their local inertial reference frame.
I assume that this statement ...
- 201
2
votes
1
answer
162
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Question on the value of speed of light, non-inertial frames and equivalence principle
One of the axioms of special relativity concerns on the value of speed of light measuread by a family of inertial observers. They must measure $c$.
Now, the global inertial frame is lost if the ...
- 315
0
votes
1
answer
115
views
Does gravity change local space and time units?
Gravity is the curvature of spacetime. Therefore, gravity affects spatial and temporal dimensions in some parts of space. We know that measuring the speed of light in the observer's local inertial ...
- 201
-2
votes
1
answer
40
views
Why does relative speed of light when in a non-inertial frame does not increase when viewed from an inertial frame [duplicate]
I mean to ask if I have a moving object and I turn on a bulb in that moving object, when viewed from an inertial frame, we usually add the speed of the moving object with the object's velocity to get ...
- 97
0
votes
2
answers
36
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Preception of a beam from different reference frames [closed]
Lets say there are two spaceships A and B in the vaccum of space. There are a few scenerios that I would like to explore.
Case 1: A and B are both stationary and the distance between them is a light-...
- 179