Time dilation in plain english

In summary, the speed of light is constant relative to all observers, regardless of the frame of reference.
  • #1
phyti
452
8
This is a response to the those asking for a non technical explanation,
and those who claim there isn't one.
 

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  • #2
Hmmm, that doesn't seem any simpler than typical textbook explanations and I'm not sure that it's correct in any case. For instance

The speed of light c in a vacuum , is constant relative to its point of origin.

Is not true. The speed is constant relative to all observers!?

It should be emphasized that the time dilation is a result of the frame moving with respect to light,
not motion relative to another frame.



The equations verify this fact.

I should hope not!
 
  • #3
Ditto Wallace.
 
  • #4
The paper seems to invinte one to conclude that the speed of light is not constant with respect to the destination.

This is both untrue, and ruled out by actual experiment (given the additional observation that the Earth is not viewed as the stationary, unmoving, center of the universe but rather as an orbiting planet that is constantly changing its velocity).

The speed of light is constant both with respect to the source and the destination according to relativity.

An really good explanation of the twin paradox (or of relativity) does require one to understand that simultaneity is relative - that in order to specify what "at the same time" means for distant objects, one must specify the means or frame that is used to compare them.
 
  • #5
Wallace said:
Hmmm, that doesn't seem any simpler than typical textbook explanations and I'm not sure that it's correct in any case.

It's not claimed to be simpler, just without all the math and abstract concepts.
It might be more precise if it included "independent of the source".

Is not true. The speed is constant relative to all observers!?

You are just stating the consequences of the constant speed.
Because time for the moving observer is altered, his calculations for spatial intervals (c*t) are altered by the same scale. When he calculates speed,
the dilation factors drop out and of course the speed c is constant for him.

I should hope not!

Where in the expression for time dilation do you see a factor for another
frame of reference? It's only v and c!
 
  • #6
phyti said:
Where in the expression for time dilation do you see a factor for another frame of reference? It's only v and c!

[tex] t = \frac{t_p}{\sqrt{1-\frac{v^2}{c^2}}} [/tex]What about t and t_p? One is a factor from one reference frame, the other from a different reference frame, so, no, it isn't only v & c there are the times. Plus v is the speed of a reference frame, so that is another factor relating to reference frames. Sorry, but you can't really get rid of the concept of reference frames moving relative to each other here.
 
  • #7
maybe they can put this in Wikipedia. after all it is cited and referenced and meets the criteria for inclusion.

BTW, Chris H, they are now (at this very time) giving me the boot (or showing me the exit, whatever metaphor). you were smart to leave before they did that to you.

mob rules.

L8r,
 
  • #8
G01 said:
[tex] t = \frac{t_p}{\sqrt{1-\frac{v^2}{c^2}}} [/tex]

What about t and t_p? One is a factor from one reference frame, the other from a different reference frame, so, no, it isn't only v & c there are the times. Plus v is the speed of a reference frame, so that is another factor relating to reference frames. Sorry, but you can't really get rid of the concept of reference frames moving relative to each other here.

There must be a vision problem going around.
In the attachment there is no t_p. The t and v are for the observer moving
with the clock relative to the light signals. The only other reference frame besides the observer is the event (the emission of light).
 
  • #9
phyti said:
The t and v are for the observer moving
with the clock relative to the light signals.
Huh? You refer to "the speed v of Al's frame", but don't talk about the other frame. "v" is certainly not the speed of the frame with respect to the light signals, whatever that might mean. (Why v and not 2v or 3.5v? Where does the v come from?)

You state: "It should be emphasized that the time dilation is a result of the frame moving with respect to light, not motion relative to another frame." If this can be said to have any meaning at all, it's exactly wrong.

The only other reference frame besides the observer is the event (the emission of light).
An "event" is not a reference frame. The space-time coordinates of an event can be measured from any reference frame.

I think we've seen enough.
 

1. What is time dilation in plain English?

Time dilation is a phenomenon in which time appears to move slower for an object or person that is moving at high speeds or in a strong gravitational field, as compared to a stationary observer. This means that time is not constant and can be altered depending on the speed and gravity of the observer.

2. How does time dilation occur?

Time dilation occurs because of Einstein's theory of relativity, which states that time and space are relative to the observer's perspective. As an object's speed increases, time for that object appears to slow down for an observer. This happens because the faster an object moves, the more it distorts space-time, causing time to appear to slow down.

3. What is an example of time dilation?

A classic example of time dilation is the famous Twin Paradox. In this scenario, one twin stays on Earth while the other travels through space at high speeds. When the traveling twin returns, they will have aged less than the twin who stayed on Earth. This is because the traveling twin experienced time moving slower due to their high speed.

4. Is time dilation real?

Yes, time dilation is a real phenomenon that has been proven through numerous experiments and observations. It is an important concept in modern physics and is essential for understanding the behavior of objects in the universe.

5. What are the practical applications of time dilation?

Time dilation has many practical applications, including in the fields of space exploration and satellite navigation. Understanding time dilation allows us to make precise calculations for space missions and accurately track the movement of satellites. Time dilation also plays a crucial role in technologies such as GPS, which requires precise timing to function correctly.

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