Questions tagged [time-dilation]

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Speed vs Velocity of light in Light clock thought experiment

A related question has been asked multiple times (like here, here and here). But none of those answers are clearing my doubt. In fact they're furthering my confusion. My specific doubt is regarding ...
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3answers
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A twisted triple paradox

As far as I know when a person travels with some velocity relative to other person time runs slower to him relative to the other person (Because the velocity of light is constant in all frame of ...
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0answers
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How time dilated is the average particle relative to the big bang? [duplicate]

Particles created during the being bang have experienced time dilation by means of gravitation and general acceleration for the past 13.8 billion years. On average, how time dilated is the average ...
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100 views

Can someone travelling close to the speed of light witness the end of the universe? [closed]

I have read that objects with non-zero rest mass cannot attain light speed $c$. But for the sake of this question let us assume that Mr. X can get as close to $c$ as he wants. So this means that an ...
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2answers
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Time Dilation and Length contraction - thought experiment

Sorry if this is obvious, but I've searched and cannot find this answered. taking a minor change to the light clock experiment on a traveling spaceship. putting the clock in the horizontal position,...
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2answers
194 views

Do planets experience time dilation as they orbit the sun and if so what effect would this have on their orbit

Do the planets experience time dilation as they increase / decrease speed around the sun and are experiencing higher and lower gravitational forces as they move from a closer position i.e. the ...
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1answer
308 views

Is time passing really differs on other planets/in interstellar? [duplicate]

I am aware of the idea of time dilation (which I, by the way, asked another question about) on speeds, that get close to the speed of light. Though, I wonder what other (if any) forces and laws affect ...
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4answers
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How close should you get to speed of light, in order for time to be dilated?

Recently I was watching Carl Sagan's Cosmos: A Personal Voyage. In episode 8 ("Journeys in Space and Time") there is a scene presenting the idea of time dilation, due to traveling close to the speed ...
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1answer
84 views

Time dilation caused by gravity and special relativistic velocity [closed]

I am working on an exercise for my Relativity class. The exercise is: Two atomic clocks are transported in two aeroplanes once around the Earth in either eastern or western direction. For ...
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0answers
45 views

Quantum wave function evolution and time dilation [closed]

We know that spin state evolves with time...but in non relativistic QM time dilation is not accounted ...so in Dirac equation does evolution of spin state with time depend on speed...i.e does time ...
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3answers
75 views

Can length contraction help the moving observer reach a star system 'faster'? [duplicate]

Would an observer moving with close to the speed of light ($\sim 99\%$) towards a star system that's $20$ light years away perceive the distance as being less than $20$ light-years? If yes, how much ...
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1answer
180 views

Time dilation under different references paradox [duplicate]

I couldn't figure this out... I understand that if Alice is moving relatively to Bob at a high speed, Alice's time elapses slower than Bob's. So when Alice is back to Bob and compares the clock, ...
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2answers
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How to calculate distance of earth when observer in space ship which travel with speed of light

Suppose we have two observer one is on earth and other is in space ship. If we launch the space craft and a light ray at the same time from earth, after 1 minute, what will be total distance travelled ...
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1answer
66 views

The light signal path through the light clock [duplicate]

Light clock: floor, ceiling, light signal Case 1: when light colck is in rest, light signal propagates straight up. The time the light signal needs to pass the distance floor-ceiling-floor is t Case 2:...
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2answers
118 views

Effect of time dilation in Cs atomic clocks?

Let's say, Observer A is at rest and Observer B is in a spaceship moving at a significant fraction of speed of light. B synchronized his atomic clock with A's when his spaceship just passed A. Now, ...
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2answers
133 views

Would Earth clocks tick faster than a clock on a GPS satellite if we disregard gravitational time dilation?

If we disregard the time dilation caused by a GPS satellite being in lower gravity, would earth's clocks tick faster or slower from the satellite's perspective? Edit. From earth, we understand that a ...
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2answers
202 views

A train passes an observer on a platform at half the speed of light. Who measures the proper time?

The proper time between two events is defined as the time measured in the reference frame in which both events occur at the same location. For example, a rocket that travels from Earth to Mars ...
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1answer
49 views

Is the formula for time dilation applicable only in 1D?

According to time dilation formula $$ \Delta t_{observer} = \frac{\Delta t_{proper}}{\sqrt{1-(v/c)^2}} $$ I have basically two questions: (1) Is this formula applicable only for 1D motion, i.e. ...
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4answers
445 views

Do photons experience time? [duplicate]

I was just thinking about how electric field and magnetic field vectors oscillate in a Photon. but then I remember that a photon doesn't experience any time so how can these vectors oscillate if the ...
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2answers
86 views

If we filmed what happens on an extremely time dilated planet in realtime

Say there was a planet that experienced insane time dilation due to orbiting a black hole, say 1hr on there is 7 years on Earth (something like that), and that it was close enough to Earth for light ...
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5answers
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Does time dilation mean that faster than light travel is backwards time travel? [duplicate]

Ok. So my question is, I've always heard it that Faster Than Light travel is supposedly backwards time travel. However, the time dilation formula is $$T=\frac{T_0}{\sqrt{1-v^2/c^2}}$$ And while it ...
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1answer
64 views

Time and acceleration [duplicate]

I am confused by the explanations of time dilation and gravity vs. acceleration. The consensus (and apparently experiments) is that time dilation in a gravitational field (not free-falling) is "as if" ...
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2answers
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Does the position in universe of a person not matter regarding death?

I might be completely wrong, but watching a documentary about time, the Einstein theory of relativity came up. From their explanation, time "slows down" depending where you are in the universe. I ...
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0answers
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At what rate does a photon blue shift as it falls toward a black hole and red shift as time slows close to a black hole?

Perhaps I am thinking about this incorrectly when a photon arrives at an event horizon, from an observers perspective time has essentially stopped for it and the photon has red shifted completely. ...
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1answer
52 views

Symmetry in gravitationnal time dilation: some details

This question is related to this topic However I am not satisfied with the answer. Let's try to be clear and use precise notations. Let's consider a non-charged and non-rotative sphere of mass M, an ...
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1answer
107 views

Time dilation for circular movement [duplicate]

As a thought experiment, I was trying to find a way to constantly dilate time while keeping an object effectively in place. I quickly decided that moving forwards and backwards wouldn't work—the speed ...
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3answers
142 views

Question about Special Relativity similar to twin clock experiment

This question is related to twin clock experiment but also involves a third clock. Here it goes: Suppose the relative velocity between clock 2 and clock 3 is given by $v=0.8c$. This would mean that ...
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2answers
104 views

How can we measure relative velocity of fast objects when there is time dilation

First of all sorry about the question title. I find it very difficult to ask this in less than 150 characters. I am not a physicist and only have basic understanding of advanced physical concepts. So ...
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2answers
87 views

Gravitational time dilation and distance

If I have a light clock in the centre of the earth, and one at a distance from the earth, two observers at the clocks will agree that the inner-earth clock runs slower. But if we'd look with a magic ...
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2answers
210 views

Why doesn't Faster Than Sound information transfer imply time travel or violate causality? [closed]

I am struggling to understand the answer to What are some scenarios where FTL information transfer would violate causality? In particular, I have not seen a satisfactory rebuttal to the comment from ...
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193 views

Does the Einsteins theory of a clock tower observed from a tram really explain time dilation?

We were shown a video in our class about time dilation which explained a Einstein's theory - the one where he was travelling in a tram and realized that if he travels at light speed, time will flow ...
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1answer
76 views

Shortening of distances in Relativity Theory

I am studying relativity theory and I have understood why distances become shorter from the perspective of someone who is travelling close to the speed of light. However, later on I read that the ...
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2answers
86 views

Distance between events at relativistic speeds

The problem: A spaceship is travelling between Mountain $A$ and Mountain $B$, both of which erupt simultaneously as recorded by a scientist on the ground. The mountains are $300 \; \text{km}$ apart on ...
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1answer
75 views

Does a photon box have gravitational potential, and cause GR time dilation?

I have read these questions: Does a "Photon Box" have gravitational mass? Does a box containing photons have more inertia than an empty box? And it made me curious. i understand that a ...
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2answers
136 views

Can a sufficiently large black hole have low time dilation near its event horizon?

First time posting here, please let me know if I miss anything! As I understand it, as the mass of a BH increases, its Event Horizon increases more than the rate of the mass being put in. In ...
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1answer
42 views

Can the rate at which time passes be changed? [duplicate]

Can the rate at which time passes be changed? For example, can time stop, slow down, or speed up? If so, how? Is it really time that is shifting or is it the measuring devices?
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3answers
65 views

Time dilation and The Big Crunch [closed]

When/if the universe collapses in onto itself as described by the big crunch theory, would time slow down due to time dilation (relative to our experience) as all matter gets pushed together, or do I ...
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0answers
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If time stops at the speed of light, how do photons vibrate in waves [duplicate]

I understand photons travel at light speed because they have no mass therefore they travel at the fastest possible speed, and at the speed of light time stops. If time is frozen at light speed how do ...
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1answer
104 views

Where in the solar system could we place a clock, such that it would run the fastest (relative to a clock on Earth)?

I know that time dilation occurs between two reference frames with differing velocity, or differing positions in a gravitational field. Many examples that illustrate this point involve things like ...
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2answers
173 views

How do we explain this new take on the old Twins Paradox? [closed]

Here's a new take on the age old Twins Paradox that I have not been able to figure out. We have two twins in two separate space ships at the same place and time. Twin A fires his thrusters for 1 year ...
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2answers
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Is this textbook's solution to a time-dilation question correct? [closed]

Please check if this solution is correct or not. If not then what will be it's right solution? According to me the the solution is wrong and the question is ambiguous. the wrong solution is the ...
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2answers
105 views

Gravitational time dilation and a race [closed]

If there is a person far away from a gravitational source(higher gravitational potential) the faster time passes relative to a person closer to that gravitational field. Is this correct?(this is how I ...
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1answer
69 views

How does gravitational time dilation affect how we age?

Suppose you could live on Jupiter without dying from anything except age, how much longer would you be able to live there compared to how long you could live on Earth?
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1answer
96 views

Time dilation explained using a light-pulse clock [duplicate]

I found an explanation of time dilation using a light-pulse clock in the book 'Concepts of modern physics' by Arthur Beiser: In this explanation, the clock is moving in a direction perpendicular to ...
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3answers
236 views

Thinking about Time Dilation [closed]

Shouldn't the observer on the Earth find the clock on the rocket to show less time due to time dilation and similarly in the opposite case the observer on rocket will find the clock on earth to show ...
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2answers
66 views

Trading clocks in two different reference frames

I'm a high school student, just learned relativity. I understand that observed time is different between two different inertial reference frames. I vaguely understand that time is different in two ...
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3answers
125 views

Time dilation when observed from each frame [duplicate]

I have just begun with special relativity so pardon me if my question seems too obvious. In the books I am following, there is an example of time dilation which says: The half life of muons is $\...
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1answer
77 views

Gravitational Time dilation for motion in a gravitational field [duplicate]

An astronaut is travelling towards a black hole in a space ship traveling at 0.8 C. The guy’s position is not fixed relative to the black hole. He is travelling towards it from a distance. How to ...
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1answer
87 views

Where does ones relativity begin/end? [duplicate]

If there were a space ship moving close to the speed of light, that was large enough for a smaller ship inside of it to reach close to the speed of light and it opened its hanger doors and the smaller ...
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1answer
111 views

Measuring time dilation of SR by a mechanical clock

I think this is a very basic question, but relativity is always not intuitive to me. When we say that time goes slow when moving (viewed by another inertial coordinate system), we just assume that ...