1

Physics, Astronomy & Cosmology / Re: Why must c be an absolute "speed limit"?

« on: 20/02/2018 16:53:08 »

Can the question also be asked "Why is there any maximum speed limit?"

As far as I  have understood , there must be a maximum speed limit and  it looks like c is it since it lies at the heart of all processes that have been observed .

It is the fastest that any object has been observed to go  and since there must be a maximum speed  of some kind the c is the obvious candidate.

I have also understood that c is a function of both the permittivity and the permeability of a vacuum.

So if these observed values were different ,c would also have a different value.

But there would still be a maximum speed limit.

2

Physics, Astronomy & Cosmology / Re: If I moved backwards at the speed of light holding a torch, what would happen at the start of th

« on: 17/11/2017 16:16:34 »

I race with a beam of light, start point A n finish point B.
Both light beam n my velocity is same = speed of light.

You cannot travel at the speed of light.

No matter how close you come to the speed of light (as measured from your point of departure,as well as that of the beam of light) the beam of light ,if you were able to measure its speed would still be c .

The only difference would be its frequency .

3

Physics, Astronomy & Cosmology / Re: Does reality not exist until we observe it?

« on: 01/10/2016 11:27:22 »

Consciousness causes the wave function to collapse acording to this interpretation. 

The interpretation does not refer to the consciousness of the observer but to the interaction with the device making the measurement. For example, a photon hits a detector and ceases to exist - its wave function has collapsed - and we know where it was when it hit. Bohr was very clear that the result can and should be described classically using ordinary language.
The wave function is only a probabilistic description.

Must  the interaction be with a "detector" or simply with another object?

The "observer" is an integral part of the physical universe ,is it not ? There is no such thing as a disembodied observer (or a pure observation) ,is there?

PS is there no way to format posts?