## Speed of a wave

Apparently the speed of any wave can be deduced mathematically utilising some properties of the medium.

Speed of light in vacuum is given by the Maxwell’s formula (http://en.wikipedia.org/wiki/Maxwell’s_equations)

μ0 permeability of free space, also called the magnetic constant, a universal constant

ε0 permittivity of free space, also called the electric constant

The speed of sound c is given by the Newton-Laplace equation: (http://en.wikipedia.org/wiki/Speed_of_sound)

Where P is a coefficient of stiffness, the bulk modulus (or the modulus of bulk elasticity for gases), ρ is the density

That doesn’t mean that speed of sound in air or the speed of a transverse wave in a lake are constant irrespective of the observers motion. If that was so, one could ‘weave’ a relativity theory for every type of wave and medium.

So just because the speed of light (SOL) is deduced mathematically, one can’t assume that it is constant to all observers.

The said speed must be with reference to the medium upon whose parameters and conductivity the calculations were done.

• pimikepi  On April 30, 2014 at 8:14 pm

No, but you can deduce the constant speed of light from experiment, and it is confirmed by experiment. We can measure it accurately, very accurately, and it conforms to the relativistic formulae.

Oh, and light travels in space-time, that is its medium. Aether is not necessary. In fact, if you include aether, the predictions no longer agree with observations.

I do wish you would remove this silly blog!

• drgsrinivas  On May 7, 2014 at 3:29 pm

As I have already said, no experiment straight away confirms any theory. If you resort to weird reasoning, any silly thing can be used to confirm any absurd theory. When I was arguing against that experimental ‘evidence’, a sect of your religion argued that SOL is constant because it is derived mathematically. The above post is directed to that sect only. I do understand that your sect swears upon the ‘experimental evidence’.

Let me tell you that it is actually advantageous for your stupid religion to have different sects with different imaginations and interpretations. When one sect is under threat, other sects can help your religion to survive. Obviously it would be difficult for individuals to argue against all the sects and beliefs at the same time.