This one has been in my mind for years, but I simply can not find any reason for this event.
The Situation
Imagine yourself sitting in the living room while watching television. It's 9 p.m and the news are on. Suddenly the news presenter announce of an event and contacts a field reporter, and start asking him questions or delivers us the exposition for the story.
The Problem
In these cases, most of the times, because that particular event is pretty far away from the studio, there is a time gap between the speech of the news reporter until it gets to the field reporter. Now, naturally you can think - well, thats make sence - the voice, usually travelling through some kind of electromagnetic force by using an antena or a satellite, takes time to travel long distances, thus creating this time gap between it's emerging from the studio and it's arrival to the reporter. And this is where I get to the point - When the field reporter answers back, and start talking, this time gap magically disappears, and you can see that his lips are synchronized with his voice.
The Questions
- Why is this happening?
- Both the studio and the reporter uses the same method to tranfer their voices? If not, why? If yes, why there is a time gap only in one direction?
I hope this question is physics related :)