Simultaneity of Events

[humbertojimmy]

Doesn't that simply demonstrate how relative perceptions are? After all, that would be like saying that looking (from Earth) at a star that is 1000 light-years away is as valid as looking at it from nearby. But we all know that a nearby witness has previleged view over the truth. That star could even not exist anymore, while the Earth witness would still see it as it was 1000 years ago, only the nearby looker would be able to see it as it really was.

[ZantherStone]

Guys, I think I'm missing something. If P1 starts moving toward one of the light sources, the instant it goes off, technically he's no longer in the same position. The flashes are not equidistant anymore. The light will not travel equal distances. Of course, Flash 2 light will pass him first (since it has a shorter distance to cover). Isn't this normal physics?

Like if two cars approach a cyclist from opposite directions. It's going to seem like one car is moving faster if he happens to be cycling toward it.

Oh, or is it in this case we're talking about pure light. Whereas the cyclist could see the difference in distances, the P1 in the example wouldn't be able to notice when the light began traveling..?

[vamanmalik]

Since Time and Simultaneity is not absolute. It would mean there is no absolute Age of the Universe. Maybe we are the only galaxy left?

[coconuts]

the notes in the start are good, but at the end the explanation is missing.

the example to show the relativity of simultaneity
is missing the fact that as p1 moves the two light flashes must cover the same distance from the start to p1

loke the lightning bolt and train platform thought experiment:
when a person on a platform becomes facing the middle of the train (which is passing by)
two flash lights reach this person one from the front of the train and the other is from the rea
this person is equidistant from the rear and the front
so falshing these lights mustve happened at the same time with respect this person

however for person sitting in the middle of the moving train
they sense the flash light from the front before the one from the end

but these two flashes cover the same distance with respect to this person
because te first flash is coming from the front and the second flash is coming from the rear of the train and this person is sitting in the middle of the train

SINCE the speed of light is the same
this person concludes that the flahs light from the front happend first amd cant be at the same time

[Batool.Naqvi]

sir !you are my best teacher i like your style of teaching .my question speed of light is constant in vacum or also same in air?

[shariqueahmer]

Keep up the good work man. You are educating the uneducated fools of this world who just keep on fighting all the time.

[doctorevil]

Duh! P1 is closer to one of the sources than the other so he will see one before the other?sure he can work out that they fired at the same time as long as he knows their distance. I guess there must be more to this? Not explained fully.

[bslaozora]

I watched his lectures on biomedical stuff first and they're really great. But apparently there're some problems in Physics lol
As some has pointed out already he really has not explained why simultaneity is relative in relativity...He only illustrated the situation in classical terms, which means something is