Tommy Robinson isn't the first to that the UK has jailed after a secret trial. Melanie Shaw tried to expose child abuse in a Nottinghamshire kids home -- it wasn't foreigners doing the molesting, but many members of the UK's parliament. The government kidnapped her child and permanently took it away. Police from 3 forces have treated her like a terrorist and themselves broken the law. Police even constantly come by to rob her phone and money. She was tried in a case so secret the court staff had no knowledge of it. Her lawyer, like Tommy's, wasn't present. She has been held for over 2 years in Peterborough Prison. read, read

# Wave equation

In physics, the **wave equation** is a partial differential equation for
the description of waves. It can be used to describe sound waves,
electromagnetic waves, water waves, vibrating strings and other wave phenomena.

Mathematically, the wave equation is written as
^{[1]}:

∇^{2} ψ = (1/*v*^{2}) ∂^{2} ψ/ ∂ *t*^{2}

- where:
- ψ = the wave function, which is a function of the three spatial coordinates
*x*,*y*,*z*and the time coordinate*t*, i.e. ψ = ψ(*x*,*y*,*z*,*t*). *v*= the velocity of the wave phenomenon.- ∇
^{2}= the Laplacian operator. - ∂
^{2}ψ/ ∂*t*^{2}= the second-order derivative of ψ with respect to the time coordinate.

## One dimensional wave equation

If the wave function ψ depends on only one spatial coordinate (which is indicated by *x*) and the time coordinate *t*, i.e. if ψ = ψ (*x*, *t*), the wave equations simplifies to:

∂^{2} ψ / ∂ *x* ^{2} = (1/*v*^{2}) ∂^{2} ψ/ ∂ *t*^{2}

This is for example, the wave equation for a vibrating elastic string, for which *v* = 1/(?/*T*)^{0.5}
where ? is the mass of the string per unit of length and *T* is the tension in the string.
The equation is known as the (one-dimensional) wave equation, because it admits as solutions all functions of the
form ψ(*x*, *t*) = *f*(*z*-*vt*); that is all functions that depends on the
variables *x* and *t* through a single variable (*u*) given by *u*=*x*-*vt*
^{[2]}.
Such functions represent
waves propagating in the positive *x* direction with speed *v*.

## Electromagnetic waves

Using Maxwell's equations it can be derived that the electric and magnetic fields also must satisfy a wave equation. Maxwell therefore concluded that light is an electromagnetic phenomenon. The speed of light (c) is given by the following equation:

*c*=*λ*×*ν*

- where:
*c*= the speed of light*λ*= the wavelength (the distance between the peaks of the wave)*ν*= the frequency of the wave (the number of peaks that pass a certain point per unit of time).